Evil can be localized just fine.
It's worth thinking about what evil actually is exactly, after a century long psyop to make us believe everything is relative.
The problem is our inherent urge (ego based) to localize evil in identities we conveniently don't belong to.
The line between good and evil is in everyone's heart, paraphrasing Aleksandr Solzhenitsyn.
Perpetrators and identities are two entirely different thing. Whoever denies that must show proof for the extraordinary claim that some identities have a kind of magic blood that makes them all perpetrators.
Nobody ever has shown any such thing.