Trump wants to cleanse the Gaza Strip of Palestinians. Since the other Arab countries don’t want them, the only way to accomplish that would be to kill them all. Trump may believe they deserve that but I can’t imagine him doing so.
It has been long known that the Arab countries don't want the Palestinians because they are simply destabilizing to any government that takes them in.
The Arab nations have to to engage in the public Kabuki theater that they DO care about Palestinians, because to them, the Palestinians are useful as a "Cat's Paw" against the West in general, and the United States in particular.