What can Google do to prevent this from happening? Actually very little. A strong argument can be made that market forces dictate people want their false opini

What can Google do to prevent this from happening? Actually very little. A strong argument can be made that market forces dictate people want their false opinions confirmed, and if you fail to provide that they will stop using your service. It is really no different then losing trust. If you assume a service as a bias, like say promoting an agenda you disagree with. You may start using that service less and less. Google combats this with individual search preferences. So it's search results rarely leave your internet safe space. If you promote a honesty index you lose this safe guard. Suddenly search results will challenge people's opinions, and they may stop using the service.