This isn't a gun control issue. It's an issue of not recognizing mental health issues early enough.
I really think this is the case. People are going to argue for and against gun control, but in truth I don't know of any new laws we could impose that would prevent this crime, nor can I think of any old laws that we should remove that would prevent this crime. So IMO both sides of the gun control argument should probably stay silent on this one (though of course they won't.)
The affirmative action argument is even more insipid. The less said about that, the better.
We have ignored mental illness in this country for far too long. There are two main barriers to dealing with this issue: first, it has an impact on individual rights- are we willing to invade privacy in order to truly determine who is mentally ill? Are we willing to curtail their rights? Second, it's going to cost a whole lot of money.