I agree with @Michael Biggs. My tolerance for violent @ssh*les is pretty high, I figure anyone I'm evicting probably has those tendencies. And the gun... Well, maybe because I'm from the great State of Texas, I just figure everyone has one.
So, I wouldn't pass, but I would use other people to do the dirty work, ie. have the constable do the eviction, etc. Odds are he isn't coming back. They know they aren't supposed to be there and are waiting for someone to have the balls (or a strong uterus) to kick them out. But they'll take advantage as long as possible.
Point two, most importantly, everyone is responsible for their personal safety, and most do what makes them feel safe, but ALWAYS be ready for the worst, always have a plan to get away or to stop (sometimes permanently) the other person. Remember, ultimately, the cops aren't responsible for your safety, you are. The cops generally take the report for the stupid things we do. /rant over