It has to do with culture. Take traffic precautions. People stop speeding when you place speedbumps. You might need those speedbumps for 5% of traffic users, but it useful. Nobody has claimed that there is a speed dictatorship.

The same goes with moderation. You create a culture where you allow everyone there say, and add specific speedbumps (rules) where your community needs it. Otherwise you get the 5% that overruns the place, skewing the discussion disproportionately.

Source : was moderator for 5 years (not here)