I wouldn’t be too worried about what the imagined liberals in the walls might think. There can’t be too many of them and bad faith actors will always be able to find something and take it out of context. And if you can’t speak freely as a communist on a communist niche forum where can you?

Stalin, unlike any of the morally pure western leftists, actually held power and had to defend it and he did so successfully. It’s not like aligning the USSR with “moderate” imperialist nations didn’t have it’s downsides but the alternative was to be overrun and slaughtered by the more radical fascists.

A pragmatic alliance made for lack of better alternatives doesn’t change the analysis of the nature of social democracy. They serve the same master as the fascists. Where the social democrats wants to preserve capitalism by bribing a select labour aristocracy into complementary the fascists use more direct violence but ultimately they will both tend to side with capital if it’s rule is threatened.