What's in a phrase? Post-truth politics

In an Economist article discussing the pros of a Remain vote in the Brexit referendum, there was this sentence:

Yet in the post-truth politics that is rocking Western democracies, illusions are more alluring than authority.

So true.
So sad.

Later in the article, this sentence appears:

Thus the Leave campaign scorns the almost universally gloomy economic forecasts of Britain’s prospects outside the EU as the work of “experts” (as if knowledge was a hindrance to understanding). 

Looking south from Canada to the travesty that is the Trump candidacy, we see the same attitude, as if only the ignorant can know the truth.