I agree with MLeakes last statement but here's the thing.
There are dangerous, highly unstable people who should NOT have easy access to weapons or ammunition. What changes or policy issues could make the general public safer is what gun owners or 2A supporters should discuss.
I'd heard that Jerrod Lautner, the young man who shot Rep Giffords in the head in AZ wanted to enlist in the US Army but was declined due to MENTAL issues. If he was so unstable he couldn't enlist wouldn't that be a "red-flag"?
I also heard the guy in the CO movie theater event(2012) was interviewed by a university faculty member who denied his admission & sent emails out warning other campus admin offices of the young man's behavior. That could be a red flag.