German citizens post-WWI were being pummeled with the
Dolchstoßlegende propaganda (I prefer
Dolchstoßlüge) that had them believing that the loss of the “Great War” was due to some undefined (and spuriously-claimed) treachery of Jews with respect to the disestablishment of the monarchy there.
The only people pushing stuff like that in the USA today are the liberal “anti-Zionists” defending the lies of the so-called “Palestinians” and worse, indoctrinating college campuses and pushing the lies through the liberal media.
The Stab-In-the-Back Theory is a very popular tactic for fascists in politics now. But they haven’t come for everyone, yet. They will, and no amount of “we are Germans, too” will stop them.