I am not arguing in favor of authoritarianism or against democracy, to be clear. Just saying there is an inherent risk that if you give the common people power, the common people might do something dumb with it. I’m not aware of a system that removes that risk without other considerable downsides. There are other democratic governments that have fewer structural issues than the US, but none of them prevent the whole “sometimes, voters are very dumb” thing.
In theory, if he went so far over the line that he became very unpopular, then Congress members would fear for their reelection chances if they didn’t publicly break with him. But with him attacking democracy itself, Congress may be more afraid of him than they are of voters. It’s a deeply troubling time.