A column in the Times explores how Trump is representative of the original meaning of the word idiot--"a prepubescent, parasitic solipsist who talks only to himself."  It became clear to me during his inaugural speech that he is a pathetic little man.  The idiot is a danger to public life, as the Greeks understood:

The idiot cares nothing about public life, much less public service. The idiot cares only about his own name. The idiot, by way of his actions, can destroy the social body. Eventually, the idiot destroys himself, but in so doing, potentially annihilates everyone along with him. He is a ticking time bomb in the middle of the public square.