megalomania
noun
meg·a·lo·ma·nia ˌme-gə-lō-ˈmā-nē-ə -nyə
: a delusional mental illness that is marked by feelings of personal omnipotence and grandeur
The world would be better off if a meteor struck when and where these buttheads were meeting.
He, and all of the participants, do not suffer from megalomania, they are consumed with evil. Don’t try to give them an illness from which they can make excuses. Name the true culprit, evil, pure simple.