What you see as "groupthink" is really your bias attempting to dismiss any number of people for disagreeing with you. I understand the point of your post, I just don't find that particular bias funny enough to let it pass uncommemted.
There's actually no way to prove that either case is true. However, you expressed a position as a certainty -- "what you see as groupthink is really..." -- that is in reality just another opinion. Therefore, your comment is equally as ill informed and myopic as OP's.