I find it's way too easy and even done for comfort to just label Hitler or Stalin "evil." Do I like them? God no!
Was the Holocaust an absolute utter atrocity? No doubt whatsoever.
Were the allies the dashing chivalrous heroes? Well, some probably were, sure. But not all of them. They were pretty racist, treated ex holocaust gay prisoners like **** and even locked up decent Japanese people in America as a "precaution." Hell wasn't antisemitism still prevalent in society after WWII?
Is history as clear cut as "good guys vs bad guys?" Nope, not really.
Like the number of Jews who actually fought on Hitler's side during WWII. Yes, they did exist. As many as 150,000 if memory serves. Some with Nazi and sometimes even Hitler's explicit consent!
Was Hitler a bad guy? Well, yeah. Kind of an understatement. If there's truly justice in the world, his torments in Hell would greatly outweigh most souls down there. But was he totally evil? Well..... He was an animal lover, had a family, a wife etc. It's easy to just brush Hitler aside as some evil entity. But he was a human being, with nuances, hypocrisy, arrogance but was not completely devoid of any shred of decency whatsoever. He was a proponent of (arguably inconsistent and hypocritical) eugenics, which stemmed from racism. And racism was pretty common in his time, to be honest.
I honestly don't know much if at all about Stalin, but same process applies. He was a human being who did terrible things. But he's not Satan or evil incarnate.
Our past is full of evil deeds. The destruction of many indigenous people and cultures for example. Was everyone who fought against Native Americans evil? Not necessarily. Ignorant to be sure. Committed bad deeds? Sure. But people are more complicated than just "good" and "evil."
But I digress.
See the inherent teaching of Sin especially in Abrahamic traditions is filled with instilling guilt and shame. If a number of society bombards women who have an abortion for whatever reason with this teaching, calls them "murderers" "sinners/sinful" "baby killers" and so forth, is there any wonder that some women feel nervous about getting an abortion or even feel bad after getting one? (True this is not definitive of the entire pro life movement, but there's a consistent element within the movement who resort to these arguably disgusting tactics.)
I think there's more to these correlated feelings than just "afraid of sinning/being bad."