"Well, he should have armed himself . . .
. . . if he's going to decorate his saloon with my friend."
There are so many quotable lines in this film, though this remains my favorite. At this point Munny has no need to answer anything to anybody, yet he chooses to answer Little Bill's "Well, sir, you are a cowardly son of a bitch! You just shot an unarmed man!" While Munny has clearly reverted to his killer days, again an "intemperate", he now feels compelled to justify his actions to those he is about to kill. He does not appear conflicted about it at all, yet he had previously gone through a period of redemption because of his wife and now he apparently needs to express a justification for his actions for all to hear.
I love this film. I don't know if it's my favorite Western, as I have many. It probably is my favorite modern Western, or anti-Western if you prefer, certainly among the top. I see comments here that it has not aged well, etc. I think it's just as fresh and relevant as it was upon its release. Near perfect film IMHO. Yeah, just finished watching it again tonight.
"Dave, this conversation can serve no purpose anymore. Goodbye." 2001: A Space Odyssey