I don't think this is a very big problem: an additional factor is that people are uncertain about what the community believes and what expressed beliefs harm reputation. They may expect others to agree with them (the "silent majority"), or at least open to be convinced.

People also vary in what kind of reputation they care about (some love being the Daring Rebel Speaking Truth To Power); so between dissenters that don't know they're dissenters, and those who don't care, enough different points of view should be introduced.