Tennessee Gentleman,
I don't have a problem with background checks, but as you suggest, ALL of the system has to work including mental health professionals reporting those who display a propensity towards violence. I say background checks stay and we get the system working, because it has failed in recent history.
My suggestion that 2A rights are being infringed is more in line with the OP question of how to define "common". Don't take away my right to own what I want just because they aren't enforcing the current rules. Fix the system, but don't limit 2A rights. My example of the 1A rights was to make a point. No one would EVER think to limit the media, but in my mind they are contributing to the killings just as much as a firearm. Voluntary responsibility on their part would be nice, but we can't (and shouldn't) infringe on 1A rights any more than the government should step on my 2A rights.
Fly