I think it's important for Biden to call out this moment for what it is. It will be difficult to do, though, without alienating the people in the country who have incorporated Trump into their political identity. When you point out that their emperor has no clothes, they will feel exposed themselves and lash out at the truth teller.
Biden has to try and build a coalition of all sorts of people to meet this moment. Especially all the people who are disillusioned with the situation in Gaza right now. It amazes me how all those people would think Trump would be any better at that. Trump would sell out Gaza to build a resort if we let him.