Why are you so eager to find an excuse to kill someone?
A conversation can start about law and order with everyone on the same page, but when it becomes clear that one of the guys is eagerly searching for an excuse to kill someone, everybody else kind of moves away from that mental case.
Nobody is seeking “an excuse to kill someone”. The killing occurred and the question is justification, which ought to not even be in question based on the location it occurred in; but based on the actions of the slain person, it was yet justified.