So I was disagreeing because there is a pretty broad range of circumstances in which I think it is acceptable to end another sentient life.

Ironically enough, I can think of one exception to my view that the taking of a human life can only be justified if the person poses a direct and measurable threat to oneself or another or others and the taking of their life is the only possibly effective counter, and that’s if the person has expressed such disregard for the lives of others that it can be assumed that they will pose such a threat. Essentially then, it’s a proactive counter to a coming threat. It would take very unusual circumstances to justify such a thing in my opinion - condemning another for actions they’re expected to take is problematic at best - but I could see an argument for it at least in the most extreme of cases.

That’s ironic because your expressed view here means, to me, that it’s at least possible that you’re such a person.

To me, you’ve moved beyond arguable necessity and into opinion, and that’s exactly the method by which people move beyond considering killing justified when there’s no other viable alternative and to considering it justified when the other person is simply judged to deserve it, for whatever reason might fit ones biases.

IMO, in such situations, the people doing the killing almost invariably actually pose more of a threat to others than the people being killed do or likely ever would.