When did Moses go wrong?

Charlton Heston went from
supporting civil rights to this:

In an address to students at Harvard Law School entitled Winning the Cultural War, Heston said,

"The Constitution was handed down to guide us by a bunch of wise old dead white guys who invented our country! Now some flinch when I say that. Why! Its true-they were white guys! So were most of the guys that died in Lincoln’s name opposing slavery in the 1860s. So why should I be ashamed of white guys? Why is “Hispanic Pride” or “Black Pride” a good thing, while “White Pride” conjures shaven heads and white hoods? Why was the Million Man March on Washington celebrated by many as progress, while the Promise Keepers March on Washington was greeted with suspicion and ridicule? I’ll tell you why, Cultural warfare!"