People like JD Vance only respond to might making right. You can talk shit, and kill his ideas, logically until you die. he won't be swayed, even in the slightest. Fascists respond to fascism because it is an inherently violent ideology that they believe will allow them to enforce violence on people they don't like. That is is their language, violence, including shows of "strength" that show you can enact, and enforce, said violence. Things that truly call this into question, being bullied, being on the losing end of violence, and otherwise being made to look "weak" publicly, actually do damage their position within their fascist group because they show that the outsiders are stronger than this person.
Yes, it is sad, but we are beyond being able to reason with the GOP. They know they are, in the long run, the loser if things stay as they are. They realized they need to take the government, take it, if they want to have a real future. They have been orchestrating this for decades. This is coming to a head. It is beyond being able to show them the error of their ways, and that the majority do not like that. They do not care. I will not be surprised if they, at least try, violence. Like real violence, if they lose big in the next ten years, or less.