Hrm... There's something disturbingly wrong about that sequence. You are only allowed to kill someone if they kill you first.. Yay..

I'm of the opinion that a threat invites force in retaliation. IE, if someone threatens me (IE, by waving a knife in my direction), I'm entitled to kick their butt. The simple act of threatening me gives up their right to not be harmed. Likewise, if they are in my house uninvited, I should be able to threaten them even though they haven't threatened me. Am I supposed to just let them come in and take my stuff because they haven't threatened me yet?