Genghis Khan wiped out more ethnic groups than Hitler even had a passing opinion about, but his tactics are still taught at military academies and war colleges and his basic doctrine--maneuver warfare--has for centuries been the most effective.

Moral judgment and proficiency are two different things. Ford was a brilliant industrialist who happened to be an anti-Semite. It doesn't mean we can't learn from his example, though we might think twice before we build massive statues of him.