X was a black separatist. He asked why blacks keep depending on the grandchildren of the white slave owners to solve their problems. The white man caused problems in the black community. They couldn't be counted on to help blacks.
"After introducing herself, she confronted Malcolm and his associates with this question: “Don’t you believe there are any good white people?” He said to her: “People’s deeds I believe in, Miss, not their words.”
She then exclaimed: “What can I do?” Malcolm said: “Nothing.” A moment later she burst into tears, ran out to Lenox Avenue, and disappeared by taxi into the world."
“The worst enemy that the Negro have is this white man that runs around here drooling at the mouth professing to love Negros and calling himself a liberal, and it is following these white liberals that has perpetuated problems that Negros have. If the Negro wasn’t taken, tricked or deceived by the white liberal, then Negros would get together and solve our own problems. I only cite these things to show you that in America, the history of the white liberal has been nothing but a series of trickery designed to make Negros think that the white liberal was going to solve our problems. Our problems will never be solved by the white man.”
Malcolm X
I think that MLK and Malcolm X had an understanding, where it was Malcolm’s job to show himself as the only alternative if MLK failed in his objective. Sort of “Good cop/bad cop”.