The Arab world notices very quickly when the US makes a promise and then ignores it. And irrespective of the wisdom of making such statements to begin with, the loss of respect for the US has consequences for generations to come.

Buy EoZ's books!
PROTOCOLS: EXPOSING MODERN ANTISEMITISM
If you want real peace, don't insist on a divided Jerusalem, @USAmbIsrael
The Apartheid charge, the Abraham Accords and the "right side of history"
With Palestinians, there is no need to exaggerate: they really support murdering random Jews
Great news for Yom HaShoah! There are no antisemites!