David Boaz asks this over at TCSDaily. He makes the point that we're still kicking Nazis in the movies, and British colonialism gets kicked from both the left and the right, but there has been precious little on the 1-200,000,000 killed in the 20th C under communism. There are a few movies, which he notes, but not many. Out of that many deaths and that interesting a bunch of maniacal dictators, there must be another story or two, eh?
The obvious conclusion Boaz wants us to draw is that Hollywood, and the arts crowd in general, underplay how miserably evil communism was, because they are a left-leaning group. (He fails to mention all those comedies about lovable and wacky Russians that populated the screens from 1960-1990. They also had their effect.)
That's a reasonable point, but it is part of a larger, more reasonable point: no one anywhere does historical movies unless they have a modern lesson in mind. It is rather like the Robert Fulghum post below. When you use an historical subject, you get to subtly say Do we have to keep learning this lesson over and over, people? This isn't new; it's a lesson you should know by now. It's an equal opportunity condescension, as we have all see it used to make a variety of religious or anti-religious, American or anti-American, moral or amoral points.
It's a lot more artistic than Fulghum is, though.