Whistlestop. I can't see that the fact that millions of civilians on the other side are being butchered ever stopped most people supporting "our" side in a war. Even with Vietnam the impression I've got is that, for Americans, the casualties that really mattered, both at the time and retrospectively, were American conscripts, rather than Vietnamese civilians. There's no wall of remembrance for the Vietnamese civilians. (And the same is true for other countries in other wars.)

And when it's your own civilians that get killed by the other side in a war, the effect seems to be to make the country under attack even more determined to fight on. Even death camps have that effect. (So did General Sherman insofar as he waas engaged in terrorising civilians rather than destroying the resourcer s that made continued resistance possible.)

Now if they could come up with some way of waging war which selectively picked on politicians and so forth, it might be a different story.

Short of that, some guarantee that generals and politicians who intentionally kill civilians or commit other war crimes can never be safe from the prospect of facing trial in a war crimes court might just slow them up a bit. Including the ones from England and France and America, not just from the little countries. Too late for General Sherman of course. Pity.