You can call it by other names, and you do; mentally ill for example. Yet, there is no rational objective reason to declare anything wrong, evil or whatever; not even the extinction of all life in the universe, or torture for all. There is no "objective evil" any human could declare, it boils down to opinions; so I make up my own mind. Deal with that, not with strawmen.
More to the point, nobody calls the leaders of the allies evil, despite they having done equally abominable actions, like killing 250.000 civillians (men, women, elderly, children, babies, kittens et al) with two nuclear bombs, or bombing hundreds of thousands of civillians in Dresden to shreds. But they are not called "evil", because they were on "our" side
No, because that was in response to a huge campaign to conquer Europe (let's ignore the death camps and whatnot for a moment). I am German, and I would laugh into the face of any German crying about Dresden. All things considered, Germany was treated a thousand times better than it deserved during and after the war. You haven't been to a whole lot of historical museums dealing with the topic, have you? Or seen movies, that kind of thing? Anyone who murdered and ultimately defeated Nazis was on my side, no quotes needed. I know the allies were and are full of crap as well, and did and do plenty of evil (my subjective idea of it, get it?) things, but in the case of the Nazis, no response could have been too brutal. I would not say this about other dictators, but "as a German" that's how I feel about the Nazis, who weren't just horrible to Germans and German Jews, but to all of Europe. But that doesn't mean I buy into any dichotomy making the Allies holy or something. Just that I'm glad they were stopped somehow, seeing how shamefully Germany handled herself.
it's not like they enjoyed killing people (as is probably the understanding of naive people calling them 'evil')
No, that's just a strawman. Fact is, they didn't mind. In my books that's enough.
Part of the massacres were result of the inevitable power plays in huge countries with hundreds of millions population under a revolution
Let's grant that; what about the other parts? The personality cults? How convenient to tell me what I think and then refute it.. and I feel kinda bad because all of this is off-topic to begin, but I couldn't let this slide.