That's a good comparison, but I find that actual science v creationism debates help
the situation. This I hear from some who switched to the science side.
As I mentioned earlier, teaching about the evolution controversy is worth doing,
but creationism (like Holocaust denial) should not be treated as factual.
But it's good fodder for debate.
What I gathered from the situation in question was that the students were basically asked to treat the Holocaust as a subject of debate from the get-go, though, without having a solid background on the facts about it and the scholarly consensus that it is a historical fact. In my view, this opens the door to legitimizing denial of the genocide of several million people. I think such possibility outweighs any benefits that might come from picking the Holocaust as the subject of the essay.