Yeah it's not like they were being brainwashed
I do wish they had made that clearer, rather than implying that everyone was so happy to have their "pain" eased that they'd follow Sybok on any fools errand. And the whole "one life changing pain" thing was a little weird. Not everyone carries a "secret pain." And even if we all did, so what. Okay, I admit, I carried around a "secret pain" for 23 years. But after talking to my shrink, I got past it. And while I think she has awesmoe legs and I'd hit that in a heartbeat, I wouldn't betray all my friends to do it.