What Explains the Trump-Zelensky Oval Office Clash?

The now infamous Oval Office shouting match between Trump and Zelensky seems more bizarre in hindsight. It is clear that Trump wanted the mineral deal according to the NYtimes and there's no clear indication that this was a setup or ambush.

The whole thing degenerated when VP J D Vance interjected and took over. The question is why? There was nothing to lose. Well, nothing, but the presidency. Ever since President Trump said JD Vance is not the obvious, slamdunk heir apparent, it's put Vance on a course to show that he is in fact the heir apparent. And the only way to do this is to bring on the crazy. Trump set the model of crashing norms and being brazenly outlandish. JD Vance has learned the lesson and is unapologetically applying the lessons he's gleaned from his mentor.