It's no use to point out what a loathsome person he is. The Trumpers see him, not as a person, but as a sort of avatar of right-wing populist nationalism. They think putting him in power means bringing back the Good Old Days, when white and Christian and male and straight was the default normal for American identity, and it was possible for a white man with only a high-school education to earn a middle-class income. (That was possible because labor unions were so strong, then. Trump never talks about bringing back unions.) That's what it means to Make America Great Again. To vote for Trump is to vote for that.