So far I don't see anything on google news about video games being related to this in any way. If you're using Call of Duty as a combat simulator, you're probably an idiot. Gunning down a bunch of people doesn't give credit to the games he played as realistic (Call of Duty isn't), it just means he brought enough ammo and knew how to operate his gun - and that the country he did it in has police without guns...
Also: In the US, the Tea Party has its 'stay out of my first amendment' goals, and any possible demand to make the government do something about this would be very out of character. It was just recently ruled here by the supreme court that the government cannot restrict the sales of violent video games because of the first amendment right to freedom of speech. The Tea Party probably sees that as a victory, since it leaves restriction of video games sales to minors in the hands of the market (where it is being handled perfectly well already) instead of with the government. The Tea Party, of course, is a conservative group and I would expect their view to be represented on Fox News (though I do not watch Fox News, so I have no idea).
In any case, what would you do, require a background check and a 12 day waiting period for all games, movies, tv shows, comic books, viewing the news, and for leaving your home? There's no way to stop deranged individuals from acquiring a game which they, in their deranged mind, think would make a good combat/terrorism simulator.