To me, “support us for ten years and as soon as we seize power we’ll oppress/kill you” goes in the con column rather than the pro. Maybe I’m wrong but I feel like the pink triangles are nearly as famous as the yellow stars.
I mean, obviously the number one reason not to be a Nazi is that you’d be a fucking Nazi. Also gay people, Jewish people, Romani people and every other kind of people are people, so they are a diverse group and somehow some of them are going to convince themselves that they ought to back a group primarily famous for executing them. With hundreds of millions of gay people in the world, some of them are going to back groups that want to kill them, but it does run contrary to our culture’s idea of people acting in naively self-interested ways.