As @Miniestelle said:
“ Ive come to the conclusion that elites like David Cameron, Johnson etc.. are bred with a sense of certainty that they will rule and have great power. To enable this to happen they must also have great confidence and self belief ”
Yep, from the handful I’ve seen close up they usually come with, on the surface at least, a massive amount of self confidence/self belief, and that in itself is seen (rightly or wrongly) as an asset in many lines of work…..