Well, if we're gonna be serious about it for a second...

Kind of like with how the NatSocs don't actually mind 'rolling coal', and are basically infamous for having 'yellow fever', I think it's an issue people missing things on both sides. It's going to depend on each person, but I think some NatSocs are attracted to the masculine symbolism and signaling within Fascism and National Socialism, and there are women who are particularly hungry for said masculinity. Black women are looking for nearly toxic levels of masculinity because they have almost no ability to be feminine, and Asian women because so many Asian men are feminine. For the straight NatSocs, they want to emulate that masculinity. For the gay NatSocs, they are also attracted to it.

So why would a gay NatSoc be attracted to a cat boy? If we set aside grooming by porn earlier in life, I would argue that a gay NatSoc and the cat-boy have a complimentary taboo relationship. Literally, a kind of 'forbidden lust' from both party's, and each would probably get off on being safely humiliated or degraded by the other because they are polar opposites. Technically, Nazi topping a Cat Boy, and Cat Boy power-bottoming a Nazi feeds into both their fetishes.

What about the Nazi who's also a Cat Boy? Well, he's both top & bottom. He's a "switch".