Why??? Israel didn't consult the US before taking this action. I think it's about time the US stops blindly going to Israel's aid. But I'm repeating myself. That's what happens when you get old.
I think at this point it is just trying to contain the explosion. I go back even farther than that and still ask why. The US was the very first to nation agree taking that land was "legal". Who else have we given nuclear weapons to?