Why are we taught about the Holocaust more than Stalin's regime?

I think it is because of a few reasons, the main ones being that most allied countries fought against the Nazi’s, but fought with Stalin. Therefore Stalin and Russia was a friend for a long time, and you don’t badmouth friends, especially when they have a short temper and a nuclear arsenal - that was never an issue with Nazi Germany.

This isn’t really an issue nowadays, with Soviet Russia no longer in existence and Russia for the most part being horrified at Stalin’s acts. But there are likely to be a few more reasons, mostly relating to the holocaust being forefront in many people’s minds after it was over - many allied soldiers would have seen the results of the Holocaust firsthand, but the same cannot be said for the results of Stalin’s regime. Nazi Germany picked on Jews, who wanted to be vocal about it after - Stalin picked on his own people, who wanted to keep it quiet after. So, I think the reason why it is not taught, or taught in depth is the sum total of all those, and also because not all of the facts are known for sure. I agree it should be taught however, but not everything that should be taught is - and then again, Japanese school children are taught about World War 2 as if it was Japan who were the victors, and that Pearl Harbor was a great victory.