A large number of them don't have to admit that - this is what they wanted in the first place.
They are preconditioned to suck his cock.
They are raised to hate big cities, Democrats and the civil service. So when a crude, boorish celebrity descends to their level and entertains them, they already believe that the cityfolk, civil servants and Dems are plotting to overthrow him and they defend him and love him.
He's a creation of their ignorance, hate and bigotry. He validates and directs it and lets them believe everything they hate is hateful in actual fact. And so they love him.
Just like the 18th Century mob loved and cheered highwaymen on the way to the gallows. The highwaymen were vicious, predatory thugs, but the common people believed that they were their champions against the rich aristocrats and loved them. Thus it is with Trump the Orange Monkey.