David Brooks' article "More Treatment Programs"
Is very reasonably written and contains the following;
Yet, after every rampage, there are always people who want to use these events to indict whatever they don’t like about society. A few years ago, some writers tried to blame violent video games for a rash of killings. The problem is that rampage murderers tend to be older than regular murderers and they tend not to be heavy video game users. Besides, there’s very little evidence that violent video games lead to real life violence in the first place.
These days, people are trying to use the Aurora killings as a pretext to criticize America’s gun culture or to call for stricter gun control laws. (This doesn’t happen after European or Asian spree killings.) Personally, I’ve supported tighter gun control laws. But it’s not clear that those laws improve public safety. Researchers reviewing the gun control literature for the Centers for Disease Control and Prevention, for example, were unable to show the laws are effective.