I'm not saying they "deserve" to die. It's not about what anyone deserves.

I'm asking if you think we can get through this with zero casualties. If it comes down to it, if he was... about to brainwash all of us, or something. Put demon influence in our heads so we all play out his conflict all the time, helplessly. If that happened, and you had the opportunity to kill him, would you stop, for the sake of some faceless souls in hell?