Actually, I think the better expression is that "self-preservation" is a natural right. I'm not so sure that standing your ground is always a good idea. Besides, with regards to public space, there is less and less of that all the time. The mall? Entirely private property. What's even funnier is that more often than not, a sign that says "public property" usually has the line "no trespassing" underneath. However, those are unrelated issues.
Are you willing to kill someone over what's in your wallet?
Shoot low, sheriff. They're riding Shetlands!
Underneath the starry flag, civilize 'em with a Krag,
and return us to our own beloved homes!
Buy War Bonds.