It’s potentially more complex than you make it sound. Ever see that picture of German soldiers being shown photos of the death camps? Most Germans didn’t know about the atrocities being committed by the Nazis, most soldiers didn’t know.
We have the benefit of hindsight and knowing all of the details that were only revealed after the war ended. So we know that the SS were pure evil, but did the Ukrainians that just survived the Soviet genocide against them know that?
It’s all a messed up pile of shit, but we need to be careful about expecting everyone in the past to have the expanded knowledge we possess in the future.