Why is it that people that act like egotistical know-it-alls are often the ones selected for job vacancies?

Question

...when in fact they're just arseholes that are drinking buddies with the hiring managers.

Answer 1

That is what life is all about. Too honest may not bring you anywhere. But too much dishonesty may land you in deep trouble.

Answer 2

some people actually have all thoes skills. Some lie thru their teeth and noone checks their stats.