I find the “she had it coming” stuff insane.
There were only two posts in the entire thread, 7 and 26, that even intimated that. That said, crime of passion has been used as a defense or argument in mitigation of sentence in U.S. criminal law forever. An example is a guy who walks into his house, sees his wife in bed with another guy, flips out and does harm to either or both of them. The argument is that he doesn't have the requisite state of mind for criminality. It's basically a temporary insanity defense. That was not the case here, though, because he had time to think about it and decide what he was going to do. I'm amazed he got only ten years.