While some argue for more guns among civilians as a deterrent, the Associated Press points out a troubling number of untreated disorders among young adults in America:

Almost one in five young American adults has a personality disorder that interferes with everyday life, and even more abuse alcohol or drugs, researchers reported Monday in the most extensive study of its kind.

The disorders include problems such as obsessive or compulsive tendencies and anti-social behavior that can sometimes lead to violence. The study also found that fewer than 25 percent of college-aged Americans with mental problems get treatment.

A weapon in the hands of a rational agent makes sense from many angles yet there is a troubling reality that many people struggle with substance abuse and outbursts of uncontrolled violence. This study helps bring the importance of good parenting, health care, and a broader picture of personal security into perspective.