Yoseikan, your whole post contradicts itself. The first paragraph says weapons use is ALWAYS bad, and that dishonor has nothing to do with it. The third paragraph says the question is whether your action was justifiable or not. HELLO! If justifiable, it is honorable. If not justifiable, dishonorable.
PS, who here has actually FIRED a gun, so we can tell if you speak from experience or from ignorance?