If they are floating it, I'm all for it.
I've been wanting to post this for a while now, but I think they should do it and we should give up whole states to accommodate everyone that want's to go, like an exchange program, people who aren't nuts can move into the houses of those who want to go to their precious Whitopia (and the nutso's will move into the decent people's homes). It just has to be made clear that once they move there, there is no going back. Once everyone is settled, and all infrastructure is set up, put up walls, so none of the "riff raff" can get in and keep everyone inside nice and safe. Heaven on Earth.
In reality, since they agreed to stay put and not to leave, the walls would be put up to keep them in. No escape. Like others have said, once it's all said and done, and their lives are still shit, it couldn't possibly be their own fault, so they'll have to blame someone!1!! "Well... I'm blond and blue eyed! You have brown eyes and brown hair! You're not a real white person! I'm much more Christian and white than you! Etc." I fully believe it wouldn't take long for them to wipe themselves out. Just leave them to it and once they've all gone take the land back. People who aren't monsters will not go to these places. Meanwhile the rest of us can spend that time trying to fix all the damage the orange idiot and his cult have done.
"High Power, Hyper. Let's!" - Kou Seiya