the ill-informed anti-Communism of Henry Louis Gates Jr.

SO I was watching an episode of the PBS series, Finding Your Roots.  So Gates was investigating the ancestors of Dustin Hoffman in Russia, and he talked about the anti-Jewish pogroms in the Ukraine in the wake of the Bolshevik Revolution.  He ignorantly blamed the communists for the pogroms when the perpetrators where the anti-communist Cossacks who killed Jews because they blamed them for communism.  How could such ignorance pass on PBS?  Did Gates learn about communism from his college at Harvard, Richard Pipes?