[mrnoodle]

Oh I see what you're saying now.

To answer your question, I think the line should be drawn on behaviors, not on inanimate objects. The line on what can and cannot be legally owned has absolutely no bearing on whether or not someone is a murderer, and casting a wide net over all gun owners will not prevent violent crime. If someone intends to hurt someone else, they'll do it; they won't stop to consider whether the instrument of their violence has the appropriate paperwork. Moving the line all the way to the right won't create more murderers.

Of course, someone who obeys the law will still comply if the line moves all the way to the left. Whoever keeps track of such things will note that X number of guns have now been made illegal, and falsely believe that they are no longer available for criminals to use. Not so -- most of the people who surrendered the guns weren't going to use them illegally in the first place.