From my friend DISPOSABLE:
The Second Ammendment is not about the right to own a rifle. It was put in place by our forefathers who knew that an unarmed citizenry is helpless against a tyrant and that another inalienable right is to protect ourselves. With it they were declaring that the people should always be able to defend themselves against the government.
That in fact, the goverment should never be harmed to the point that the citizens were defenseless.They could not see the day when things like tanks and cruise missles would exist, upsetting that balance completely; but I am sure that they would panic to see what little protection we do have being stripped away and limited by that very Government.