I`m sorry, your post caught my attention, so let me elaborate on two points a bit
1) It's a tragedy, yes, but it's mainly an american tragedy and not everyone is from America. And even if it were my own country's tragedy, I still come go google+ to get entertainment, not cry. I would read news, if I wanted to know more about what happened there and mention how sad it is and how guns need to be controlled.
2) The shootings weren't as frequent before media started catching up on it. I was bullied at school too, but I never had even the slightest idea of killing someone at school, before I heard in media about shooting in America. Thankfully, I was smart not to give into that crap and I lived happily ever after. However, not everyone is so strong and more of that you can read on you Facebook.
So anyhow, you want to make the world a better place? Send a card to the mourning families and SHUT UP ABOUT THAT.
Least that's my opinion, you are welcome to disagree.