Yeah, I would. I might try to avoid it so I'd stay out of court, but I'd kill somebody if I had to.
Those who claim murder is not an action ever taken by sensible people of sound mind should understand the truly vague nature of "sanity" in the first place. In my experience, the only "sane" people are those completely convinced of their own insanity, and the ones who claim to be "normal" are the folks you have to watch. Normalcy is a lie. It's a subjective, conformist and arbitrary measurement used to brainwash people into believing whatever one wants them to believe. "A normal person doesn't behave like X. A normal person doesn't do Y. A normal person always obeys Z, etc."
Once a person steps onto my property without my permission (especially at night, or in the company of others), I have to assume there are no limits to what he will do. If he doesn't have limits, well, neither can I have them if I want to stay alive and protect people important to me. Any hesitation can be fatal, and cooperating with him might just get me killed. Murder, pah! I'll resort to assassination if I think that's the only way my loved ones and I can escape with our lives.