I, nor anyone else, changed the argument. As there were very few details in the original post this debate was not constrained to go in a specific direction largely in part of the generality of the story. There is no specific issue other than a bad guy got killed doing something wrong by the owner of the property in question. Based on that statement, with no real detail, this debate can go anywhere it pleases.
Reading this thread is like examining a microcosm of America. What it SHOULD do is make people pause and ask themselves "At what point, if ever, will I be strong enough to make a stand to protect my family and property and to what lengths will I go to insure their safety?"
Of course those limits are different for everyone, as they should be.