Criminal Insanity "Some traits or dispositions are inherited, but the continuity of behavior, including antisocial activity, is maintained by social contexts and other aspects of the environment." Criminal insanity is a topic which sparks much heated debate. What causes insanity? Is insanity a physical or psychological problem? Is insanity actually a disease, or just a figment of a persons imagination? Groliers Encyclopedia describes insanity as "a mental defect or disorder sufficient to prevent a person from knowing the difference between right and wrong conduct or from understanding the nature of his or her actions." This definition is one which would