I try very hard to see your point, and at some stage I thought perhaps in the realms it would morally good while not in the real world and vise versa, but no matter how much I think of that I can't find it "good". If you are talking about self defense it is something else entirely. But if you kill someone on sight because he might be evil* you are evil. If any of the good aligned Gods allow this kind of behaviour it is more of problem of the settings than of your train of thought.
*Not talking about situations like war zone or something like that.
