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.
We don't know the backstory here, but usually these events are all about someone whose life is spinning out of control for any of a dozen reasons, and either nobody has a clue that anything was wrong or everyone thought that the guy was a timebomb and did nothing.
So everyone who wants a gun will do whatever they need to get it? No one who wants a gun will be deterred by any possible prevention measures?
Measures such as background checks, safety class requirements, mental health checks, restrictions on high-capacity or high-throughput weapons, higher taxes, manufacturer and supply chain oversight, spying on domestic traffickers, or closing the gun show loophole?