There is, in a law, such a thing as a "justification defense," (sometimes called "necessity defense" or "choice- of-evils defense.") In the past, but very infrequently, it has prevailed in misdemeanor cases (e.g. simple trespass.) And there are cases where it is justifiable: it's certainly legitimate to discuss it.
I'd be very much surprised if any FReepers said it was applicable in a 1st degree murder case. I knew, personally, such a murdrer once (Jim Kopp). My best guess is that he would attract a measure of conflicted pity here, but no applause.
Back about 10 years ago our Dem Governor (MD) Parris Glendening pardoned a dozen or two dozen women convicted for killing their husbands because they made the “Burning Bed” type claim that they were in danger(that is how he sold it) . Then it came out that most of the murders were pre-meditated, many very coldly calculated with unpleasant details. These women started to look like that Woman Serial killer in the true movie “The Monster”. That Dem governor lost his re-election in a heavily Democrat state. This didnt help him get women votes at all.