How are you distinguishing from suppression of dissent and criticism, and suppression of uncivil discussion? From what I've seen, contrary opinions that are we

How are you distinguishing from suppression of dissent and criticism, and suppression of uncivil discussion? From what I've seen, contrary opinions that are well expressed are rewarded (even if controversial - I've got a few that ultimately got more up votes than down, but it was a ride). Contrary opinions that, well, presume a fight? Not so much.