Divide the citizens into classes, then play them off each other. A divided America is weaker than a united one.
Racist, sexist, homophobic, ageist - what do all these have in common? They're intended to create fault lines among us - by age, gender, race, sexual orientation, etc... Don't blame black people, as tempting as it is. Blame those who designed it to be this way and are influencing our cultural institutions to aggravate and exacerbate the tensions along these fault lines.
Principles, beliefs, and ideologies are the only real differences that should matter.
Pretty much agree with you there, although I think it matters more whether you believe anything based on trust or faith or if you keep an open mind.