Let's stick to actions taken by rabbonim themselves.
if everyone did onlywhat the נפש החיים did, we'd hardly be having this conversation.
There were a number of letters written that list specific items.
none of those are in front of me
A difference in ideology is a very good explanation.
I fully agree that there were differences in ideology, that each side had ideological complaints against the derech the other side followed. that is grounds for a sharply worded letter, nothing more.
the claim that some were on the way to apikirsus and were doing objectively evil things, and the pushback saved them from themselves is what I'm rejecting.
I'm claiming that the רבנים and the המון עם on both sides were תלמידי חכמים, עוסק בתורה, מקפיד על קלה כחמורה and were pursuing a valid path in avodas hashem. neither loved the others' path.