I'm worried about the bits that are internal to a person, where people just have some common failure modes when trying to solve problems.

shrugs Well, seatbelts don't stop accidents, but they do reduce the side effects of getting into one. While the disputation arenas do not directly prevent such internal failure modes, they help prevent that internal failure mode in a key influential person from spreading to the rest of the group. Yes, hold off on proposing solutions (don't drink and drive). But also put some extra railing and padding so that others making a mistake do not necessarily get you into error either (seatbelts)