A proportion of them know all about his mental instability, long line of business failures and disgusting behaviour but just don’t care. He hates the same people they hate and makes it ok for them to say so. Trump is a cult (sic). He is quite clearly a figurehead, there’s no way he’s actually in a fit state to run a country.
Americans have long been susceptible to them in various forms. They flourish more over there than they do here. Sadly it’s rapidly extending to our politics.