It maybe a bit fallacious to assume the white race is the best race. Certainly from our own perspective it is, and that is all that matters in the end, but maybe human kind 100,000 years down the line would be better served by leaving the best of every race and culture to grow and develop, giving our evolution more "looks".
Everyone has their own utopian fantasy, and mind is a network of trade and communication that doesn't involve cultural or ethnic dilution between the races of the world, where the average IQ of the entire population is above 120, and every tribe acknowledges every other tribe's right to exist, and every tribe acknowledges it's own right to exist. War would be less of a necessity because the human population would be well under a billion, leaving resources and space plentiful. The burden on the planet would be significantly lessened, and the biosphere would be able to return to "normal".
A planet that truly respects diversity. Our society pretends to respect diversity, when all it really wants to do is destroy it by mixing every flavor at once, and holding no standards.
Who the fuck wants to go to a Baskin Robbins where all 31 flavors are mixed together at random?