This popular belief that nobody really does or can know anything is the perfect soil for an authoritarian leader to take root.
Only if we can trust each other to try to be honest can we hope to rebuild something resembling a truly functioning democracy. Otherwise, sooner or later this country will be seduced by the siren song of yet another strong and authoritative voice.
Humans are finite creatures and any truth we lay claim to will of necessity be partial, multi-faceted, and complex. At our best, we see only part of what is there and articulate only part of what we see. The promise of democracy — when it works — is the possibility of combining all those partially glimpsed and imperfectly reported realities into a still imperfect, but nevertheless better, whole.