No Reason

No matter how intelligent a person, or how much knowledge they've accumulated, if they refuse to recognize logic and reason, they'll never be capable of making a positive contribution.  All they'll ever do is use their intellect to convince themselves of the lie which benefits them the most.  Almost every leader to exist, from the lowest tin pot to the Maos and Stalins of the world, has been this particular type of illogical sociopath.