Well that’s not how anything works. E.g. how many babies might be saved by Russian economic development from having access to the sea through Ukraine? At this scale the moral calculus isn’t easy.
War has led to plenty of development through history, and development saves babies. Do you think Italy or Germany would have been better off as bickering principalities, without Giribaldi or Bismarck? Do you think China would have been better off as a bunch of warring states?
I agree on Iran but this is different. We could have sold steel and fuel to the Germans and Japanese in WW2, but we didn’t because they were engaged in something evil.
The Germans were engaged in the holocaust, which was evil. The Russians are invading a sovereign country to replace the government, which the US has done twice in as many decades.