Imagine for a moment that you're a nigger. Imagine your skin is the color of poop. Imagine you have an IQ of 70, grew up without a father, and have a violent temper than you cannot control.
Imagine you live in a constant fog of confusion among beautiful, intelligent Godlike creatures who built a society that you could never replicate or even understand, and who are obviously far more successful than you could ever be. Everywhere you look, you see White Men, created in God's image, who can learn things much faster than you, can control their emotions better than you, who grew up in loving households with two parents and four grandparents, whose relatives support and love them.
Their successes are a constant painful reminder of your genetic inferiority, your race's weakness, your stupidity, inadequacy, impotence, and worthlessness.
Imagine knowing that you are unnecessary -- and indeed detrimental -- to their survival, whereas they are vital for yours; that their lives would be infinitely better without you, but your life would be infinitely worse without them. Without White Men, you would be unable to continue the civilization they've created, and would revert back to poverty, disease, and animalistic survival within a generation.
What a soul-crushing and cruel existence that would be. Wouldn't it drive you to absolute madness? Wouldn't it make you hate the world, White Men, and God, for cursing you with your black skin and black soul?