That reading of how non-German socdems responded to the rise of Nazi Germany sounds reasonable, but I think it's pretty far from Stalin's idea that socdems were anticommunist above all else, to the point where they operated basically hand-in-hand with fascists. If fascism can become such a big threat that your social democracy sides with communists against it, your social democracy is doing something closer to conventional geopolitical maneuvering than to picking sides based on ideology.
Bringing up nationalism as another distinct ideological factor is also a good point. There's more to these situations (especially in the imperial periphery) than just fascism vs. communism.
That reading of how non-German socdems responded to the rise of Nazi Germany sounds reasonable, but I think it's pretty far from Stalin's idea that socdems were anticommunist above all else, to the point where they operated basically hand-in-hand with fascists. If fascism can become such a big threat that your social democracy sides with communists against it, your social democracy is doing something closer to conventional geopolitical maneuvering than to picking sides based on ideology.
Bringing up nationalism as another distinct ideological factor is also a good point. There's more to these situations (especially in the imperial periphery) than just fascism vs. communism.
Theres definitely more nuance to it yeah.