Groupthink is mostly a problem because it happens subconsciously. A group that actively wants its members to think a specific way has always had other means.

Groupthink is mostly a problem because it happens subconsciously. A group that actively wants its members to think a specific way has always had other means. When you're (as the leadership of an organisation) actively installing a filter, I think you'd be quite more likely to install the filter that would say "Error: The message cannot be sent because it merely reinforces the majority viewpoint and does not add new information to the conversation."