I think that he exposes the weaknesses in the American system.
They have chipped away at it for a long time, subverting democracy in this way and that.
Like the amount of money needed to be a political player, the increasingly undemocratic nature of both parties, the redrawing of the electoral maps, the lobbyist money, no term limits that facilitate the McConnels etc.
All of those efforts lead, in one away or another, to Trump.