From the Daily Caller:

. . . some of the conservatives who made their Second Amendment case so eloquently then ignore their argument, point by point, so they can blame violent movies and video games. And here’s why that’s stupid (and undermining their case against gun control):

Well made arguments follow in the article.

For instance, if violence and murder rates have been in decline — all the while that violent videos and games have been on the increase — then just as there’s no link to gun ownership, there wouldn’t be a link to, say, playing Mortal Kombat.

The author makes his case far better than I can, here.