Maybe it is the same reason why Black Panthers and other black hate groups hate white people. It is because they are both racists!
They have hate in their hearts they usually learn from an early age either from their own parents or from outside influences of peers. People mistake this as ignorance, but not entirely these people are sometimes well educated. They a lot of the time project what they hate about themselves at those who are different.
Sometimes they think everyone hates as much as they do and believe in fighting black before blacks kill them. See we tend to base what we do on how we feel about ourselves. A lot of them feel other races are inferior because they unconsciously believe THEY are the inferior ones.
Soto answer you question every hate mongering bigot has his own reasons. The trick is to relies hate when you see it and fight it with all you got.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.