The official story is Joseph Stalin good, Adolf Hitler bad
But the commies always fall into their own traps
npr: How a Republican state lawmaker tried to let Holocaust deniers hijack history lessons
The U.S. could presumably have remained neutral and uninvolved in WWII were it not for Pearl Harbor.
As to 6,000,000 Jews killed, it could have been individuals who for various reasons who were not welcome in Christian churches at the time, whatever their faith was, and the Jews claimed them or "welcomed" them as their own after their deaths as a gesture of faith.
It was a war and a lot of people died. Millions on both sides of the war, in fact. Horrible atrocities were committed. Nobody disputes that, but if Joseph Stalin's treatment of Jews in Soviet gulags was any better than Adolf Hitler's treatment of them in the concentration camps, then we're going to walk on the Holocaust denial charges.
Much of WWII was a drug war left over from WWI, when the Austrians and Hungarians were high on opiates. The Nazis as well as many Jews were high on drugs but it wasn't socially acceptable to say that back then.