It turns out that in order for a group of people (a committee, a market, a society) to make the best decisions, it needs dissent.
This is not to say that any old dissent works. The point is that when there is disagreement that is properly handled, everyone examines their own beliefs, re-checks their assumptions, and improves their opinions.
What does not work at all is for everyone to retreat to their own echo-chambers, and then inexorably radicalize one another through a process of social competition (this is apparently a well studied phenomenon, in which a group can, under certain circumstances, collectively move ideologically quite far off into the weeds as everyone tries to guess what everyone else thinks, and then expresses an opinion slightly more radical than that).
What does not work as dissent is for members of these groups to go on strafing runs of other groups. Yes, yes, when they do it, it's trolling and when you do it it's expressing your opinion and exercising your right to be heard. You're both doing exactly the same thing, which has the effect of further radicalizing the other guys. It doesn't help anything and, in fact, it's just more social positioning. Trolling is a spectator sport, and it's no fun unless your friends are watching.
It's got to stop. Dissent has to be accepted, embraced. You've got to welcome the other guys, and actually listen. Here's an interesting fact for you:
If you set up an experimental scenario in which the planted "dissenters" are in fact objectively wrong, the group that is properly set up to listen to them will still make better decisions. So the fact that the other guys are, in your mind, WRONG, SO SO WRONG!!! is actually irrelevant. If you listen to them, welcome them, include them, you will still be smarter than you were before.
The echo-chambers and endless radicalization will destroy us all. I am not kidding, and that is not hyperbole.