I would maintain that he got in because he is evil, and he and other evil people got together, and decided they would pay whatever it cost, say whatever had to be said, and do whatever it took, for as long as it took, to elevate their representative to the presidency, then use the opportunity to reconfigure the government so it was theirs to exploit for as long as there is anything left to take.

That means creating an election system that filters out the competent and sincere, and filters in charismatic liars and conmen, gaming that system as much as possible, and finally rigging elections.

And Trump may not seem charismatic to you, because you picked Critical Thinking Skills along the way. But Republicans have suppressed the teaching of Critical Thinking Skills in public schools, so we have an entire nation that looks at a guy in a suit who is telling them everything they want to hear, and they love him, and vote for him. Then they only have to steal enough votes to put him over the top.