Why are cartoon bad people almost always ethnic?

From Cruella Deville to Gargamel to Tangled, Despicable Me, Boris and Natasha, and it seems that having dark hair, off white skin, and a curved or crooked nose and an accent seems to automatically make you a bad character. Think about what that is teaching millions of kids across the globe. Has this point ever been raised? Has there ever been a blonde/blue eye cartoon villian?