Vitriolic partisan statements quickly appeared on the Internet after James T. Hodgkinson opened fire at Republican congressmen practicing baseball near the capitol. Many blamed the violence on politics. But Peter Ditto, professor of psychology and social behavior, says psychological problems are why people act violently.
"People who are prone to this kind of violence will find justification for acting out from religion, from politics, from whatever," Ditto told USA Today. "I don't think that it's fair to say all this political conflict that we're going through is going to make a lot of people go out and shoot people."