I think Trump has been trying to get out of this thing almost the entire way, and just keeps failing forward.
All of his many, many opponents in the primary turned out to be absolute pushovers, every single one. The slightest attack and they just withered. Who was left standing? Wackjobs like Cruz, Kasich, and Carson. He ends up winning the primaries even though he only won 44% of the vote, and he was running unopposed at the end!
Meanwhile the other party is running a geezer Vermont socialist against a woman that no one can stand and has more baggage than a 747. What does Trump do? He unleashes an avalanche of gaffes, attempting to offend every conceivable voting bloc there is. When the gaffes don't end his campaign he proceeds to tank all three debates. That'll do it for sure, right? Nope, wikileaks and the FBI sweep in to prop him up again.
Finally, trailing in every poll, a huge swath of Democrats offer up the coup de grace and skip the election entirely. He wins, despite getting fewer votes than his opponent! He can't lose even when he lost!
At the victory party it looked like Trump didn't even give a damn. I kind of feel for the guy. It's only four years!