לא ליסתור בי כנישתא עד דבני בי כנישתא אחריתי… משום פשיעותא (מגלה כ”ו ב’).
I read Rabbi Nosson Shulman opposed the opposition to “Shemiras Shabbos Kehilchasa” because no alternative was (then?) available. (I don’t know if he meant all written opposition; “Lechoshvei Shemo”, Rabbi Benyamin Zilber, etc.)
The same is true for showing certain Jews their rabbis are ignoramuses.
This is also the lesson behind the tale of the scholar who tried to correct an isolated simpleton’s prayer. Then, the simpleton forgot what he was taught, had no one to consult, and ceased praying altogether.
That’s what various “zealots” refuse to grasp…