> Evidently, Jan Sloot was a crank. He showed all the signs attributed to cranks. He was paranoid. He felt himself an expert in a field he had no higher education in. He worked alone. He spent decades on one problem any mathematician could have told him was impossible to solve in the first place. He got angry at people who questioned him. He felt misunderstood. He had delusions of grandeur.

This describes very much some of the antivaxers I know :)