Why do some Blacks call Bill Cosby an Uncle Tom?

He got an education, is intelligent enough to create a life through comedy and working as an actor and raised his children to work hard and pushes for education. Why the problem with that?
Update: Thanks Wendell. Mr. Cosby has done a great deal of good. He puts his money where his mouth is.

I agree our penal system is in great need of revamping.
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