But the part that you don’t seem to comprehend is simply that no matter how high you set the standards, you will kill innocent people. What if somehow evidence comes out that shows you got the wrong guy instead of the one who kills 3 kids? You’re going to say “you just have to be sure”, but there is literally no way. Nobody in the history of humanity has figured out how to do what you’re proposing without killing innocent people, and I’m pretty sure nobody ever will.
So there are invariably only two options:
kill people and innocents
don’t kill people and don’t kill innocents
Unless you’ve found a magic solution that 100% ensures infallibility in the justice system, there is no third option. Understand now?