If they make a law that you can't buy a gun with a history of suicidal ideation or psychosis or certain mental illnesses that would mean that everyone running a gun store would be privy to my personal info. I can see ones information being available if you are a violent criminal who has made a choice deserving of a punishment. I didn't choose bipolar, but I do want to be the one in control of my personal information. There is a bigger issue here.

Plus... I keep me safe from myself, not the guy selling or not selling a gun.