Palestinian leaders really need to learn, that being Palestinian doesn't give them the right to sign agreements and then abandon those agreements.
I understand being Palestinian leads to the world coddling you and treating you like spoiled child (only applies to situations where Jews can be blamed), but that does not really give you a right to do whatever you want, whenever you want, however you want.
Palestinian leaders need to learn that they too, should behave like responsible adults. You sign an agreement, you follow the agreement.
If their only "punishment" for their childish behavior is that some Jews can build some homes for their children, then that is a pretty small price to pay.