Granted that there were also religious implications, but the Celts didn't scalp, they took the whole head.

The folks in early Israel collected foreskins from the dead. So did other peoples in Asia Minor.

Ears were collected by some in Vietnam, and also in the Pacific -- and in the Pacific both US and British troops weren't adverse to collecting heads from the Japanese.

Since you went to the afterlife in the same condition that you left this one, Plains Indians would mutilate corpses. The Vietcong did not originate the practice of cutting off genitals and stuffing them in the mouth....

I leave other ugliness to your imagination, but will only say things like "Treblinka" "Buchenwald" and "Auschewitz" to make my point.

"Spoilings of war" are limited to one race, that's the human one.