Why the Clueless Feel Like ExpertsThe cognitive blind spot masking failure

From the show

Oh, god... really?

The Dunning-Kruger effect explains why those with low ability consistently overestimate their competence. Since the skills needed to perform a task are the same ones required to evaluate it, the incompetent lack the capacity to recognize their own mistakes. This results in unearned confidence while true experts are left doubting themselves.