The American Presidency is a storied and historic office, not just a job but a symbol of the nation, of its civic and cultural identity, so it has been difficult for a lot of people to come to terms with it being occupied by someone who is quite so openly and vocally a gibbering idiot. Hence the need to pretend that these pronouncements represent proposals into which serious thought and effort has been invested, rather than the momentary whims of a bloviating narcissist.