> If it were about truth alone, the person who is right could be content with being right and not caring what others believe, just like they don’t care about 99.9999% of beliefs held by others either.

Disagree, if you care about truth, you're not going to just let people spread any opinion as if it were fact. It has societal consequences. That way lies the dark ages, witch hunts, wrong people getting into power. Of course one needs to be judicious in which battles to fight.