I do, however, think there's a subtler failure mode than "heretics get shouted down", namely, "heretics have to put up with spurious isolated demands for rigor, logical rudeness, conversation-halters, &c., such that the community doesn't update or updates slower than it could have."
This is, of course, a much harder problem to solve, because "Speaker gets shouted down" is easy for third parties to detect as a discourse-norm violation, whereas "Speaker's (polite!) interlocutors are engaging in motivated continuation" is a subtle judgment call that a lot of third-parties are going to get wrong. But if and to the extent that such a thing does happen in our community—and you shouldn't take my word for it—I think it's causally downstream of silencing going on elsewhere in the trash fire that is Society (which we're not isolated from).
I do, however, think there's a subtler failure mode than "heretics get shouted down", namely, "heretics have to put up with spurious isolated demands for rigor, logical rudeness, conversation-halters, &c., such that the community doesn't update or updates slower than it could have."
This is, of course, a much harder problem to solve, because "Speaker gets shouted down" is easy for third parties to detect as a discourse-norm violation, whereas "Speaker's (polite!) interlocutors are engaging in motivated continuation" is a subtle judgment call that a lot of third-parties are going to get wrong. But if and to the extent that such a thing does happen in our community—and you shouldn't take my word for it—I think it's causally downstream of silencing going on elsewhere in the trash fire that is Society (which we're not isolated from).