I would say that 10,200 drunk driving deaths in the US during 2010 is a societal problem. But how did we go from tracking injuries and deaths in the U.S. to comparing our fundamental problems with other countries? I feel like those are separate issues. Maybe not, but if that's the point you're trying to make, let's talk about Obesity and Adult onset diabetes in the U.S. compared to other countries. Those problems and the deaths that occur because of them kill a lot more people than guns do each year...
ETA: Most everyone calling for something to happen in regard to guns and their regulation make legitimate points, but I just really dislike it when the masses get riled up after a recent event but forget about systemic issues that don't sell newspapers.
And I also strongly believe that anything the government does will be counterproductive (and inefficient) to what we're trying to fix. I mean, the mere mention of banning 30 rd. clips and AR-15's has led normal people that would never think about getting one, to getting two. You can't find a Bushmaster AR-15 anywhere, and if you do, it 200% more expensive than it was two weeks ago. It's like prohibition except with guns...
However, I also strongly believe that you should at least have to go through a background check and a waiting period before you get a gun (any gun). After that, though, it should be regulated by each state and then regulated by SRO's and responsible gun-owners like anything else (cars, liquor, etc...).