No, the argument for distributing it would be that other propaganda is widely distributed without question, so if one wants to arrive at anything even close to an objective account of what transpired during that time in history, all propaganda should be examined and learned about. The truth usually lies somewhere in the middle, and we certainly aren't getting to it by blindly accepting one narrative over another.
Extremism can be more-or-less objectively defined in terms of difference from the mean/median. Measurement is tricky but just because something has fuzzy boundaries doesn't mean it's meaningless. Especially when something is not near that fuzzy boundary.