hat being said, there is that persnickety wording "Well regulated." To me, that means that "the Militia" Being you and me, have to meet minimal guidelines of fitness in order to be allowed the right to bear arms. That means we can't be violent felons, (Those who cannot be trusted with weaponry) Mentally disturbed (Those who can't handle the responsibility of weaponry) and those who are pacifist in nature (We can't force people to carry, who don't want to.)
In the context being used and at the time the Constitution was written, "Well regulated" means the same as "Well trained". It merely means the "militia" were expected to be skilled in firearms use.
The concept of "felons" not being able to possess firearms is relatively new. It began with the 1968 Gun Control Act as a means of banning firearms to a certain section of the population. As with most gun control laws, it has nothing to do with controlling crime, just people. Prime example is the more recent addition of another group of Americans, anyone convicted of "domestic violence". This group is now banned for life. Recent discusion has sought to expand the list of banned Americans to include anyone ever diagnosed with PTSD. They too, would be banned for life. Seems the anti's fear our returning military veterans. If they ban enough groups, they can succeed in banning firearms from the public with banning a single gun.