Is “these magical predatory animals are basically born in SS uniforms and are naturally inclined to do fascist things and orchestrate a fascist society” a flawed and problematic premise?

I think yes, because they are sapient - meaning they’re created (by the authors) in the image of humans and this naturally (because they’re a race in the narrative) makes them read as an allegory for human “races”, hence the appeal for chuds. I understand that probably wasn’t the intent of the writers, but if not, it seems like it was poor execution on their part.

It’s never going to be a good idea to have a “race” in fiction that is actually evil by nature, I think.