EDIT: I see my post is being downvoted. I know that it may come across as insensitive to immediately leap to the gun control debate, but frankly I'm more angry than upset by this news. How many times does it have to happen? We have a good 48 hours of emotional outpouring and then everyone forgets it ever happened.
Support for gun control is extremely shallow, a lot of people are for it if asked a yes/no question but the activist population of people who would change their vote, volunteer time, or donate money is tiny.