I don't "believe in" racial separation, I'm tolerant of it. There's a difference.

I believe in legalizing weed. I don't use it.

I believe in legalizing herion and all drugs, but I don't use any. I'm tolerant of other people that chose to.
Meaning I don't believe I have some kind of right to tell other people or worse, force people through political violence to do and not do what I want.
I believe legalizing but I don't "believe in" them as if they are good or bad.

So if some people want to have their own country based on race, religion, sports, whatever the fuck, I'm not going to use politics (violence) to stop them.