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German terror bombing of British cities was intended to crush morale and that didn't work did it.
You can't really compare. Total civilian deaths for the UK were 67,000, of which half were in the Blitz. Total civilian deaths for Germany were between 1.5 and 3 million.
The sins of the dead do not compromise our moral standpoint today.
They do, especially if you pretend they didn't happen. War crimes are tried in court, where legal precedents usually determine the outcome.
Personally I think Russia's invasion is a crime, whether they kill anyone or not. i'd say that every war of aggression is criminal. But the law doesn't work that way, because if you class the invader as a criminal just for stepping over the border, you don't give him an incentive to feed POWs or not use chemical weapons.
Vietnam is a prime recent example of a nation not willing to lose, no matter the cost.
Also German terror bombing of British cities was intended to crush morale and that didn't work did it.
This "Every time we accuse others of war crimes we need to think about how our own history is seen by others" is daft. The sins of the dead do not compromise our moral standpoint today.