Indeed,  I know many.  Known them all their lives.  Know their parents, their grandparents, their friends.  They learned all sorts of bias including hating black people.   Bias is learned.  I lived in a Muslim country for awhile.  Most hated Americans. Almost all hated infidels.  No human being is born hating another.  It must be learned. It isn't engrained in our DNA.  Granted, and I think to your point, some can learn to hate from their own experience... bad episodes.  I get that.  But more broadly I wish people understood what the emotion of hate does to their own physical body. Cell digestion stops, Cell reproduction stops. Their immune system is compromised  The body chemistry changes.  Their DNA reacts. Not to mention the electromagnetic field generated goes negative (quantum). It is a self inflicted wound caused by free-willing themselves into hate (regardless of why).   All in "The Human Primer"... get a copy.