Your anecdotal evidence isn't very strong support. If someone had instead stood up in the group and told the manager he was wrong, would you believe the opposite, that not blindly following leadership was the norm?
The business about it being a normal group behavior is really a side issue though, and I'm not trying to make a scientific case.
The bigger issue is government suppression of dissent by the misuse of psychiatry or just by suggesting theories involving criminal activities of the government are signs of insanity.