I think the OP is complaining because the SS super soldiers can't be in, and he really wants to slaughter the inferior soviet conscripts with the best military of all time (nevermind that they lost the war).
Joking aside, a simple answer is that symbols of nazism are illegal in more countries than the symbols of communism. The eastern front was a brutal war of philosophy, and the EF team has done a great job of balancing that without being insensitive to the horrible effects of both regimes. It's a problem that Relic and modders have had to deal with from the beginning, and the obvious choice is to ban nazi symbols to allow the largest possible audience to play. There's references to ideology in both factions, and yes, the soviet faction has a more obvious propaganda doctrine, but that doesn't mean that the devs are trying to be soviet propaganda.