Socially enforced decorum still always assymetrically benefits majority dominant positions, even if it also benefits minority positions by an unequal amount. What's actually good is the assumption that everyone arguing is strapped and mildly psychopathic. That keeps people honest
Every opinion of consequence should be backed by existential threat, and the more consequential the opinion is, the bigger the scope of the existential threat should be. It's the only way to keep skin in the game.