I have to admit I was a little offended hearing the "only in America" comment. All countries have their baggage. People tend to over-generalize about the USA, so I've become less affected by it as time goes by. Yes, we have a gun culture here. It's hard to overlook that, but people seem to forget how large and diverse the US population is. When you have more people -- and different kinds too -- you're bound to have more events like this happen.
Regardless, what saddens me the most is that this focuses attention away from the actual tragedy. No one is perfect when it comes to being politically correct ALL THE TIME. Just hoping the families of the victims recover and can move on to living a normal life again.