We need a legal and political understanding of the right of the refugee, whereby no solution for one group produces a new class of refugees - you can't solve a refugee problem by producing a new, potentially greater refugee problem.
Although the history of dispossession and exile for Jews is very different from the history of dispossession and exile for Palestinians, they both have recent and searing experiences which might allow them to come to a common understanding on the rights of refugees, or what it might mean to live together with resonant histories of that kind.
It seems to me that responsiveness is a better source for understanding what moral claims are and how they work upon us.