Is the US gov't to blame for school shootings such as VT?

I was wondering who you guys should be at fault for the tragic event at Virginia Tech. Now i know a very large portion should be blamed on the actual shooter himself, but how much should be on the US government? I always hear about gun conventions and such and what else amazes me is how easy it is to buy a firearm at places such as uncle sam's and even walmart. It's as easy as getting candy from ben franklin's candy store! i am not for guns, i feel that if all guns are banned, there shouldn't be a fear of someone breaking in with a gun. in that case just use a good ole bat to crack their head open. another thing i must point out is all of the violence shown on television. my former german teacher explained how violence is not shown on german tv until very late at night so kids are not exposed to it and become immune. i see kids blowing off people's heads on video games and have no remorse at all. should the gov't take steps such as banning firearms or even program violent tv?