Tell me one other right/amendment that puts people directly in harm's way like a firearm does.  I'll wait.

And yes, I know it likely wouldn't have stopped this jerk.  But it might keep them out of the hands of some other ones.  True they could steal them if they wanted.  But, walking into a store and walking out with a firearm is a lot easier for many people out there.  How 'bout those accidental deaths?  Sounds like some people could use that gun safety course. 

Curious how it would negatively affect you?  Are you a felon?  I own several rifles and a shotgun, and I'd have zero issue with it.  In fact, I'd like it, since it'd force my son to get to that course regularly.  Him being a safer gun owner warms my heart.