Doesn't matter what a person uses to kill another with, be it guns, cars, clubs, rocks, or corn cobs. By themselves they all are inanimate objects incapable of doing nothing until put into action by a human or a damn smart monkey!
Semi-automatic weapons are not easily converter to full auto. Many of the mfgr.s go to great lengths to reduce the chances of that, except for the occasional saavy gunsmith or machinist who has access to tooling and the know how to perform the modifications.
As for a civil society, that term is rather loose. Until everyone gets on the same civil bandwagon and gets along 100%, there will be situations that end up criminal. And that doesn't even include the criminally insane!
The thug entering the home of an armed citizen if often thwarted. You need to read many of the publicized police reports that document that... and there are plenty. Interesting to note is the fact that a majority of American law enforcement officials approve of armed citizens... however they would like to see them better educated and properly trained on using firearms along with scenarios and legal issues that follow. I agree with them.
AllVol,
Tennessee doesn't require any sort of background checks or similar before purchasing a firearm? If not that absolutely rediculous! I just purchased a .45cal semi-auto last week and I was required to fill out, testify and sign both federal and state questionaires that inquire about criminal history, drug/narcotics history, mental/psychological status followed up by an instant background check through the state police's database. Surely you need to file the federal form for firearms purchase?