The question is, why are they racist? Plato suggest behavioural traits are innate, part of our nature we can't change. Aristotle disagreed, suggesting it was all down to nurture. Both, as with all ideas that use a "one size fits all" ideal, are wrong for the very same reasons extremist politics are in error. Behaviour of an individual is a mix of nature and nurture. However, there's a third, often ignored factor. We have a saying in Yorkshire, "There's no one so blind as those that don't want to see". Racists (and extremists of all other kinds) need to ignore obvious truths for their theories to work. Surely they must be aware all blacks/women/Muslims/Jews/whites and so on all individuals, not a group with all the same behaviour patterns. That hypothesis being the case, we have to examine what drives their irrational hatred. Suggestions?