It's good that in the United States the power is quite centralized and no madman, even if he became president, can break everything. Kamala Harris is rejected by the average voter not only because she is a leftist, but because she seems frankly dumb - she laughs dumbly at any questions and spouts some kind of nonsense. Even AOC looks like an intellectual against her background.
Hmmm.... keep your fingers crossed. There is a very good chance that Kamala Harris would become the POTUS in 2024. The GOP seems to be in very bad shape right now, especially after their disastrous performance in 2022 mid-terms. On top of that, Trump seems to be on a mission to destroy the GOP from inside, by defaming and badmouthing the younger (and more acceptable) leaders such as Ron DeSantis. First and foremost, in order to have a chance during the POTUS elections in 2024, the GOP needs to put that loser Trump in his place.