I will point out that there were people who didn’t vote for Mitt explaining what giving control of the Republican Party to either of those two would have meant.
And that there were and are enough of them that Mitt and McCain never were electable because too many people that are absolutely critical for a Republican win valued border security and halting the replacement and overwhelming of United States citizen voters over a four year White House term.
So the people who voted for Mitt?
They voted for a loser who had already lost the moment he was nominated.
Sometimes in life, your only choices are the bad choice, and the even worse choice. Mitt was the bad choice.