Are we living in the same country, talking about the same person? Trump's supporters absolutely will rally around him if and because he was personally attacked. It is quite literally a personality cult. By now everybody should have no doubt about this.
It is not nearly a majority, but in fairness he has a firm enough grip on mental health to be able to accurately predict that the totality of his supporters and fans will do what he tells them to do because he has told them to do it. When he goes to a rally, those people cheer at literally every single thing he says, and jeer at literally every single target he picks. When he makes fun of disabled people, they too laugh at the disabled person he has mocked. When he says Democrats want to abort babies even after they've already been born, they accept it as unassailable fact and express outrage. When he stands up in front of a conservative Jewish coalition and directly, explicitly tells the people gathered that he doesn't like them and thinks they're horrible people, but they're going to have to vote for him anyway as they have no choice because they're greedy and wouldn't want Democrats raising their taxes again, they stand and cheer enthusiastically for him. When he tells them he intends to be president for longer than two terms, they clamor for the imprisonment of anyone who would object. And when he wanders into one of his word-salad nonsense-mumbles, they cheer harder and louder than at any other time.