To me it hinges on the following:
“Throughout his text, Valtin emphasizes, as he does with the Hamburg example, the contrast between the movement’s rank and file and its leadership. The former are often described as heroic, long-suffering idealists. The latter, in his telling, are self-interested, vainglorious despots-in-waiting.”
It’s just that being among the former group, usually blinds you to the latter group, because those folks are initially viewed as being part of the former group too. It takes LOTS of convincing for idealistic people to wake up to the fact that they’ve been played. Irrespective of the ideology.
EDITED to correct auto-correct. Honestly, I don’t know why I bother posting from my phone.