Ok so the USSR approaches Britain and France saying "jeeze, this Hitler guy who keeps talking about genocide is a bit spooky. Wanna do something about it?" and France and Britain are non commital because they think they'll be in a better position if they appease Hitler for a while longer.

Poland sinks it, because they're more freaked out about the USSR than the Nazis who literally want to work them to death as farm animals which is... wild. So the USSR ends up signing a NAP with Nazi Germany, the same stance that everyone not explicitly allied to the Nazis has, agreeing to let them kill whomever they like if only they do it in "their" borders.

Using the time bought they rapidly, and one notes here pretty brutually, industrialise. Fight the everliving shit out of the Nazis once they have an industrial base and support in a war against them (the original fucking goal of the tripple alliance talks). USSR solidiers spill the majority of blood in Europe, theirs and Nazis. They're not saints, it's an army.

After the war, when countries like France are busy forgiving police collaborators and giving them their jobs back, the soviets are killing a lot of Nazis.

Stalin sucked in so many real ways, the USSR failed the utopian vision it was founded on in so many real ways. Calling Stalin a Nazi collaborator is just fucking wild. The Nazis were very explicit in their plans to genocide Slavs, that is what triggered the initial talks. Nobody in the USSR was under any illusions as to where they stood with the Nazis, the brutual policies of rapid industrialisation and militarisation were a result of being abandoned by the rest of Europe because the fucking aristocracy running the horror show preferred Nazis to communists.

Stalin Derangement Syndrome is important today to motivate hatred against Russia. Everyone loves Ukrainian nazis motivating/bussifying their citizens to the front lines, and everyone hates being called a tankie. So every lie/absurdity diminishing Stalin is useful in geopolitical demonism and diminishment against Russia. It helps the idiocracy stay moronic.

I mean, plenty of reasons to hate the allies. Including, you know, colonialism.