It's a humorous injunction that could be gainfully posted at the top of most controversial threads. Nothing wrong with warning people against bias and groupthink. Especially when the matter is deeply technical and outside of most participants'expertise.
From my perspective it's more important to protect the commons from going up in flames.
Generic warnings about "bias and groupthink" have no helpful effect anyway, let alone snarky putdowns of others. Apart from adding off-topic noise, they polarize the audience into a "like and agree" tribe and a "dislike and disagree" tribe. Then the two go after each other in increasingly nasty and unthoughtful ways.
If you actually want to reach people you have to do it differently. If you (I don't mean you personally, but all of us) don't actually want to reach people, but just to vent bile, that's not what this site is for, and there are other places to do it.
