Well, that's the key - if One actually engages in the things that he is charged with, and then Still believes he 'speaks for God', he is obviously a sick man.
Sex with young girls and the use of cocaine could certainly lead to madness. 
Whenever something like this occurs involving a priest, a teacher, a coach, etc., "supporters" arise. These people too are living in a delusion. They have invested too much 'belief' in that person than is warranted.