Question

What is the connection between irrational or dangerous behavior and mental disorders?

Answer 1

Irrational behavior can sometimes lead to outcomes that are not in an individual's best interests, or that are harmful to others. Examples of irrational behavior might include making impulsive decisions, engaging in risky behavior, or failing to consider the long-term consequences of one's actions.

where on the other hand

Mental disorders (or mental illnesses) are conditions that affect your thinking, feeling, mood, and behavior. They may be occasional or long-lasting (chronic). They can affect your ability to relate to others and function each day.