Lol, killed because he is a Jew. Stalin killed Trotsky and killed a bunch of senior officials and the military - because he was paranoid and afraid of a coup, although there was no Trotsky conspiracy.
You also ignore the fact that the Holocaust is not the murder of Jews. This is the murder of all those races that were considered inferior: Belorussians, Russians, Ukrainians, Polyaks, Gypsies were also killed. The Encyclopaedia of Genocide estimates the number of victims of the Slavic genocide, the citizens of the USSR, at 15.5–19.5 million people. Rummel believes that about 3 million Ukrainians died, about 1.4 million Belarusians, about 1.6 million Russians (not counting Soviet prisoners of war). The historian Bohdan Wytwycky believes that more than a quarter of all victims of the Nazi occupation of the USSR (in particular, 3 million Ukrainians and 1.5 million Belarusians) were destroyed on racial grounds.
So does any of that factor into your morale compass when playing the game?