You’ve thumbnailed elements of the problem, and left out the heart of the matter: The cabalistic forces of uber-rich conservatives (reactionaries) marshaled these propaganda tools to convince justifiably agreived voters to vote for a candidate who is letting them “run wild in the candy store.”
The interests and ideology of the Mercers and the Koch are diametrically opposed to any practical solution to the problem of growing inequality in the US.
They, most of the Republicans, practice a “take no prisoners” form of politics, in which they care little how either the ends or the means of their campaign affect lower class people.
The deceptive elements, and the use of sleazy propaganda, by these neo-reactionary King makers, is of a piece, whether they use modern data mining techniques or not.
If it wasn’t so sad, it would be hilarious. The joke is on all of us.