A mature American president and administration would make two points, one to Abbas, and one to Netanyahu, and make them very public:
1. Abbas: When you’re serious, give us a call. Until then you’re on your own and we don’t care WHAT Israel does to get you to pay attention – or to go away. But until you’re serious, we’re seriously gone and you’re seriously on your own. Until then we’re washing our hands of the entire mess.
2. Netanyahu: You know all those murderers he demands you set free? THIS is why capital punishment exists. Do you really think setting these murderers free to murder again is more moral than just executing them? Absurd.