The very notion that there are facts and discernible truths are being rejected by a good percentage of the American people. We are stuck in a situation where President Trump's spokespeople say things like, “Well, we have alternate facts," or "The truth evolves," or "The truth is not true." Basically, the truth has become utterly instrumental to close to half the population.
Moreover, they delight in the capacity of the president to openly lie. Everyone knows he's lying. Sometimes it's totally gratuitous, it doesn't even serve any purpose. But the very act that he lies with a swagger and so boldly makes Trump attractive. to them. That breaks all the rules about how democracies are supposed to function.