Criminal Behavior and Mental Illness: Why Understanding the Difference Matters
Understanding the Critical Difference Between Mental Illness and Criminal Behavior
As a licensed mental health professional, I have often observed how quickly society labels difficult, harmful, or unlawful behavior as "mental illness." While this assumption may seem harmless, it can create significant misunderstandings, increase stigma toward individuals living with mental health conditions, and distract from the real factors contributing to criminal behavior.
Mental illness and criminal behavior are not synonymous. Although there are situations in which an individual may experience both mental health challenges and involvement with the criminal justice system, one does not automatically cause the other.
Understanding this distinction is critical for clinicians, policymakers, educators, law enforcement professionals, and the public.
The Myth: Criminal Behavior Equals Mental Illness
One of the most persistent misconceptions is that individuals who commit crimes must be mentally ill. Research consistently demonstrates that the vast majority of individuals living with mental illness are not violent and are more likely to be victims of crime than perpetrators (Stuart, 2003).
Mental illnesses such as depression, anxiety disorders, bipolar disorder, schizophrenia, post-traumatic stress disorder (PTSD), and obsessive-compulsive disorder affect a person's thoughts, emotions, mood, perception, and ability to function. These conditions are health disorders that often require professional treatment, support, and symptom management.
Criminal behavior, on the other hand, involves actions that violate laws, social norms, and the rights of others. Criminal conduct may stem from numerous factors including learned behaviors, antisocial attitudes, substance use, environmental influences, personality traits, poor impulse control, criminal thinking patterns, or a combination of these factors.
The presence of mental illness alone does not explain criminal behavior, nor does criminal behavior automatically indicate mental illness.
What Is Criminal Thinking?
In forensic psychology, professionals often discuss "criminal thinking" rather than a "criminal mind."
Criminal thinking refers to cognitive distortions, attitudes, beliefs, and rationalizations that support unlawful behavior. These thinking patterns allow individuals to justify harmful actions while minimizing responsibility.
Examples include:
- Blaming others for personal choices
- Entitlement beliefs
- Lack of empathy for victims
- Minimizing the impact of harmful actions
- Manipulation for personal gain
- Rationalizing illegal behavior
- Viewing rules as obstacles rather than boundaries
Research conducted by Walters (1990, 2006) suggests that criminal thinking patterns are among the strongest predictors of continued offending behavior.
Unlike many mental health disorders, criminal thinking is often associated with decision-making processes, learned behaviors, and cognitive distortions that reinforce criminal conduct.
Mental Illness: A Different Clinical Reality
Individuals experiencing mental illness are often struggling with symptoms that can significantly impair their daily functioning.
Depending on the diagnosis, symptoms may include:
- Persistent sadness or hopelessness
- Excessive anxiety or fear
- Difficulty concentrating
- Sleep disturbances
- Emotional dysregulation
- Intrusive thoughts
- Hallucinations or delusions
- Feelings of shame, guilt, or worthlessness
These symptoms are generally distressing to the individual experiencing them.
In contrast, criminal behavior is frequently associated with actions that harm others, violate laws, or seek personal gain despite negative consequences for victims or society.
This distinction does not eliminate the possibility that mental illness may contribute to impaired judgment in certain circumstances. However, from a clinical and forensic standpoint, treatment planning requires careful assessment of whether behavior is primarily driven by psychiatric symptoms, criminal thinking patterns, substance use, personality factors, or a combination of influences.
The Role of Accountability
An important aspect of both clinical treatment and criminal justice intervention is accountability.
Accountability means recognizing personal responsibility for one's choices and actions while also addressing underlying factors that contribute to harmful behavior.
Treatment should never be viewed as an alternative to accountability. Rather, effective intervention combines accountability with opportunities for rehabilitation and behavior change.
Research consistently shows that interventions focused solely on punishment are often less effective than approaches that address criminogenic risk factors and teach prosocial skills (Andrews & Bonta, 2010).
Evidence Based Treatment Approaches for Criminal Thinking Patterns
Contrary to popular belief, treatment for individuals involved in the criminal justice system is not focused on "curing criminality." Instead, interventions target specific risk factors associated with reoffending.
Cognitive Behavioral Therapy (CBT)
CBT is one of the most widely researched interventions used in correctional and forensic settings.
Treatment focuses on:
- Challenging distorted thinking
- Improving decision making
- Increasing accountability
- Developing empathy
- Building problem solving skills
Studies have consistently demonstrated reductions in recidivism among participants who successfully complete CBT-based interventions.
Moral Resonation Therapy (MRT)
MRT is designed to improve moral reasoning and decision making.
The program helps individuals:
- Develop personal responsibility
- Increase ethical reasoning
- Build healthier value systems
- Strengthen prosocial behavior
Research has linked MRT participation to reduced rates of reoffending.
Thinking for a Change (T4C)
Developed by the National Institute of Corrections, T4C combines cognitive restructuring, social skills training, and problem-solving techniques.
The program is widely utilized within correctional systems throughout the United States.
Substance Use Treatment
A substantial percentage of criminal offenses involve substance misuse.
Evidence-based treatment may include:
- Residential treatment
- Intensive outpatient treatment
- Medication-assisted treatment when appropriate
- Recovery support services
- Relapse prevention planning
Addressing substance use disorders can significantly reduce criminal justice involvement.
Trauma Informed Care
Research indicates that trauma histories are highly prevalent among justice-involved populations.
Trauma informed treatment helps individuals:
- Understand trauma responses
- Improve emotional regulation
- Develop coping strategies
- Reduce reactive behaviors
Importantly, trauma informed care acknowledges past experiences without excusing criminal conduct.
Specialized Treatment for Personality Disorders
When clinically appropriate, treatment may involve:
- Cognitive Behavioral Therapy
- Dialectical Behavior Therapy (DBT)
- Schema Therapy
- Long-term psychotherapy
These approaches can help individuals improve interpersonal functioning, emotional regulation, and behavioral control.
Why This Distinction Matters
When society labels every harmful act as mental illness, two significant problems emerge.
First, individuals living with legitimate mental health conditions experience increased stigma and discrimination.
Second, opportunities to address criminal thinking patterns and promote accountability become diluted.
Effective public policy, mental health treatment, and criminal justice reform require a balanced understanding of both concepts.
Mental illness deserves compassion, treatment, and support.
Criminal behavior requires accountability, intervention, and rehabilitation.
Sometimes both are present simultaneously, and both must be addressed.
Moving Toward a More Informed Conversation
As mental health professionals, we have a responsibility to educate the public about the differences between mental illness and criminal behavior.
Reducing stigma does not mean eliminating accountability.
Supporting rehabilitation does not mean excusing harmful actions.
The most effective approach combines evidence-based treatment, personal responsibility, public safety, and opportunities for meaningful change.
When we understand the distinction, we can better serve individuals, families, communities, and the systems designed to support them.
About the Author
Christine Matthews, LCSW, MBA, CLC, CCTP, BSP, is the Founder and Clinical Director of Never Journey Alone, LLC, a multi-state outpatient mental health practice providing trauma-informed care to individuals, families, and communities.
With more than 20 years of experience in mental health, managed care, corrections, and outpatient treatment settings, Christine is passionate about mental health education, trauma recovery, leadership development, and reducing stigma through evidence-based practice.
She is also the Founder of NJA Business Group, where she helps mental health professionals build sustainable private practices through strategic leadership and business development.
Learn more at:
References
Andrews, D. A., & Bonta, J. (2010). The Psychology of Criminal Conduct (5th ed.). Routledge.
Latessa, E. J., Cullen, F. T., & Gendreau, P. (2002). Beyond Correctional Quackery: Professionalism and the Possibility of Effective Treatment. Federal Probation, 66(2), 43-49.
Lipsey, M. W., Landenberger, N. A., & Wilson, S. J. (2007). Effects of Cognitive-Behavioral Programs for Criminal Offenders. Campbell Systematic Reviews, 3(1), 1-27.
Morgan, R. D., Kroner, D. G., Mills, J. F., Serna, C., & McDonald, B. (2013). Criminal Thinking and Offender Rehabilitation. Academic Press.
Stuart, H. (2003). Violence and Mental Illness: An Overview. World Psychiatry, 2(2), 121-124.
Walters, G. D. (1990). The Criminal Lifestyle: Patterns of Serious Criminal Conduct. Sage Publications.
Walters, G. D. (2006). Appraising, Researching, and Conceptualizing Criminal Thinking: A Personal View. Criminal Justice and Behavior, 33(5), 576-589.
Wilson, D. B., Bouffard, L. A., & MacKenzie, D. L. (2005). A Quantitative Review of Structured, Group-Oriented, Cognitive-Behavioral Programs for Offenders. Criminal Justice and Behavior, 32(2), 172-204.
