"people like Boris Johnson. No lack of IQ,..total refusal to use it for anything..useful."
Don't be silly, he has parlayed his IQ into a very substantial salary (and multiple other income streams) and assiduous cultivation of Tory grass roots to get to be the PM (to the exclusion of actually doing the job when some fool puts him into a Ministerial job).
On a side note I've met cunning people and smart people.
Smart people rarely think they are cunning.
Cunning people often think they are smart.