Democracies are equally as likely, if not more, to put horrendously unqualified and highly dislikable people into power. And I'm not just talking about the most recent president emeritus. Political debates in the US rarely have anything to do with reason, and popularity is both fickle and a poor measure of what is best for the nation.
At least royals receive lifetimes of training for how to be a public figure and head of state.