You're saying that believing in democracy means believing in electoral dictatorship: whoever is elected president can do whatever they want. But that isn't supposed to be the U.S. form of government. In fact such a form of government would obviously be self-defeating: the first dictator elected would use his unlimited power to prevent anyone else from being elected.

Today's AstralCodexTen is very relevant: https://www.astralcodexten.com/p/defining-defending-democrac....