Just off the top of my head? Because they were cheerleaders for the "depose the Evil White Minority Governments" in southern Africa. Recall all the rallies for "disinvestment in Apartheid" that went on in the late 1970's and early '80's? The chorus of student protests again the old South Africa? The many talking heads from the press and entertainment arms of the Media Hive who viewed South Africa as uniquely evil- far worse than Cuba or the old USSR?
Their silence is deafening, but have no fear, once they have pitiful pictures of starving children to show us on TV at our dinnertime...
...they'll be back--