There's a lot in this thread that is stupid and inappropriate. I also agree that there are many here that do take shots at America.
Now, about this gun control thing. The state of California has insane gun laws. It usually takes about a week to get a gun (took my uncle 6 days to get all the paperwork and the background check finished when he bought his newest), we have outlawed a great deal of guns, and yet, we have some of the HIGHEST gun violence rates. So, does controlling the guns stop the problem? No. It's not the type of guns, it's not how hard it is to obtain guns legally. Does something need to be done, yes. Most definitely.
So you take the opportunity of children dying to bash on us. Things like this don't only happen in the US either. But because the US is extremely influential and the fact that every other country is watching what goes on here, things like this get noticed by everyone.