Because I believe "in for a penny, in for a pound" is flawed logic. Nearly all governing results in taking what is inevitably a spectrum, and coding it into discrete groups. Do I believe people should be allowed to own weapons? Yes. Do I believe people should be allowed to own any weapon imaginable? Nope.

Let's take explosives as a counter example -- Somewhere between a firecracker and a 50 megaton hydrogen bomb is a line. We can debate its location, but there's a line.

Why is it so difficult to understand that a similar line is reasonable on guns?