They'll just self-rationalize their idiot opinions.

They are, by all definitions, addicts. They have a chemical brain addiction to their own idiocy. They'll rationalize every idiotic thing, no matter how insane, just so they can believe they are doing right. Literally the exact same as an addict coming up with the most ridiculous rationalizations to keep getting their drugs or other stimuli.

By medical definitions they have a disease. Their disease is extreme stupidity bordering on full blown retardation.