But campaign shows us only this side of the coin.
No. The campaign shows us war. And just that. And in that it is no more or less "nazi" than it was in the first game. It has no intention to look at "other sides" of the coin, because these are irrelevant.
If these other sides of the coin are so important to you, why don't you do a well researched documentary and post it on you tube? Gives you something to do instead of whining incessantly on forums. You'd also would be able to get through to the appropriate people directly, those that would be interested in this.