It leads to an objectively worse discussion. People posting stuff, some of which people don't like, and some of which is astroturfing, shilling, brigading, for

It leads to an objectively worse discussion. People posting stuff, some of which people don't like, and some of which is astroturfing, shilling, brigading, foreign agents, and the like, is a better discussion than all of that plus people accusing everything they disagree with of being astroturfing, shilling, brigading, and foreign agents - especially since the accusations are, at best, imperfectly correlated with the reality.