The occupation after the war sure wasn’t pretty, but the allies didn’t hang around for 75 more years oppressing the shit out of Germany and going back in any time they felt like shooting some civilians, or wandering into somebody’s house and saying hey this one is mine now, or destroying water supplies just for the hell of it.
They didn’t kill around 10% of the civilian population of Japan over the course of less than a year after the war after any real military threat was ended, just because they felt like getting back at them for Pearl Harbor.
Yes, all countries commit atrocities in war. War is the process of atrocity. It’s an abomination. But not every way of going to war is the same, and what’s happening in Gaza is so different from “collateral damage” or bombing civilians in an actual military conflict, even an unequal one, that to describe it as such is basically apologia on behalf of Israel.