This is gruesome for sure. That said, most ways of killing people in war aren't good ways to go. Killing is going to cause suffering.
Ideally we wouldn't kill. And then if we do it hopefully it's quick and doesn't prolong suffering. And then if we're pushed to the point that it's us or them hopefully it's them.
Yeah that's also easier said than done. Try saying you think that you don't like pizza very much at a Mets game and people will want to attack you.
You will get shot for dissenting, even just suggesting it. They want like minded.
I agree that they can make a choice but it's also not easy to go against the general movement of a group. Or else we in the west would have changed more as well.