The final scene is reality, nothing wrong with putting it on the show. I certainly don't get a "guns are bad" message out of it either, but rather that even if fully automatic weapons should be legal (as I believe they should), it doesn't necessarily follow that it's morally acceptable to sell them to just anyone (I don't believe that it is). In any case, I don't see Kurt Sutter or F/X sending out a Brady Bunch message via this show; that would be commercial suicide.