"Trump appears to be the creation of a mind tortured by both dementia and immaturity - there's no point to elucidate to him the errors of his ways because he is not intellectually curious enough to care or change - how he got to be number 45 is now a secondary consideration to just how much utter destruction he will leave us in the wake of his presidency."

It's the Dunning-Kruger Effect at work:

https://en.wikipedia.org/wiki/Dunning%E2%80%93Kruger_effect

Basically, the really stupid are too stupid to realize just how stupid they are. Conversely, the really smart are too smart to realize just how stupid stupid people can be.