I don't care if I get hate for this, but why is rape during War considered evil and a big deal but mass firebombings and massacres not?

Soldiers who rape enemy women are considered evil and get punished in court.

But the bombers who drop firebombs to burn civilian populations alive are considered heroes.

Can someone explain?
I don't care if I get hate for this, but why is rape during War considered evil and a big deal but mass firebombings and massacres not?
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