Perhaps those coming down the the side of carrying weapons should ponder whether someone has a right to post a sign:
Do not come on my property with a gun.
I read somewhere where a guy put a letter on file with his estate attorney that if he was killed violently on a property that disallowed weapons, his estate was to sue that property owner because the owner inherently assumed the responsibility of protecting all persons on that property by denying them the right to protect themselves.