I live in AZ, I can use deadly force if you enter my occupied vehicle or house."You may use the minimum level of force that you reasonably believe is necessary to safely resolve the situation."
Generally speaking, if you make me fear for my safety I can use deadly force.
I also tend to be aware of other options for force. I was eating unarmed in BK with my family a long time ago. There was this guy who seemed to be mentally unstable. I mentally prepared about 6 ways to take him out if need be, the chairs with metal legs being option 1.