If the political left were really smart they'd be able to recognise their own incompetence.
The Dunning-Kruger effect is where people believe they are smarter and more capable than they really are. It comes about because low ability people do not possess the skills needed to recognise their own incompetence.
As Charles Darwin wrote in his book The Descent of Man, "Ignorance more frequently begets confidence than does knowledge."
I can think of no more apt description of the radical left in our midst.