Google holds the power to influence en masse. If not policed, Google has the power, if so it was to choose, to remove critical human knowledge from results. Perhaps the moonlanding never happened, or perhaps chemical weapons were faked. etc...

Their results can influence a great number of people, it can make or break a business, and it can (probably) cause or at least greatly contribute to a revolution in some countries.

You know, hence why countries like China want to control such power.