I guess I am selfish prick... I have no inclination to warn anyone. I am in my home and a person has entered into it thus I am scared that this brazen individual may cause harm to me and mine. For him to run out means he MAY return, I would invoke my right to defend my family. No ifs ands or buts or warnings. Giving a warning depletes a bit of my advantage as well.
Hmmm I never thought about this. But I agree with you on this one. I guess if there was an intruder in my home. The click of the hammer being pulled back would be all the warning he would get.