Exactly why I wouldn't advocate such a thing. As proud as I am of my genetic heritage, the numbers alone argue for an integrationist philosophy in the current social structure. A solely-mutant state would be more politically fragile than any of the ethnocentric theocracies littering the Middle East these days. Bad idea all around.

But not all created states designed for a certain group have had histories of conflict and bloodshed to establish them. Liberia, for example.