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I don't think holding such views is helpful.
Besides, a few people have been prosecuted for war crimes while being on the winning side (or by their own side), some examples:
William Calley (US), convicted for his role in the 1968 My Lai massacre, in which American troops killed hundreds of unarmed South Vietnamese civilians.
Donald Payne (UK), for abuse and death of an Iraqi detainee.
Charles Graner (US), sentenced to 10 years in prison for the abuse of detainees at Abu Ghraib prison.
However, we can agree those are very few and far between, compared to all crimes committed. But it's more useful to condemn them and advocate for more accountability than to claim it's useless anyways and normalize calls for more crimes.
If you go by the definition used in online discourse, every US President this century would be prosecuted for them.
There is using nerve gas on children and there is posting a picture of Maduro in hand restraints and a blindfold. Both receive the equal screech of “war crime” by keyboard warriors.