Man, this is a tough one. I've been struggling with this for a long time.
I don't know if the 2nd A is an absolute right or not. If its not, then who gets to decide where it applies and where it doesn't. If it is, then are we ready to defend a position that allows even convicted fellons the right to keep and bear arms once their "debt to society" has been fulfilled? Therein, I think, lies the real world crux of the matter. While debating absolute right in the abstract may be fun and challenging, aren't we ultimately talking about laws that will be decided by popular concensus, so to speak.
We are probably entering the most hostile firearms environment I've seen in my 60 years. While Heller may have decided that the 2nd A is an individual right they did so with a provision for reasonable restrictions. Once again, who gets to decide what's reasonable, the NRA or the Brady Bunch?
I'm not near smart enough to suggest an answer or policy but I am smart enough to understand that if we don't start policing from within, it will be done for us from without.
As suggested by others, I would not have a problem with a mandatory safety course required for purchase. I didn't have a problem with the one required for my CHP although that was more about legality than safety.
I realize this may violate the spirit and intent of the 2nd A, so to all you absolutists out there, sorry fellas, I used to be one of y'all.