The UN’s own failures in the past should be a warning, not a motivation, regarding involvement in a conflict where it has limited power to implement an outcome.  The UN’s goal needs to be the creation of a stable Palestinian state living in peace with Israel. This policy would in reality encourage the exact opposite. While it would do little to help the Palestinians, delegitimizing Israel’s creation would be a tool in the hands of figures in the Arab world and elsewhere whose interests in the region are not in peace with Israel but in its destruction. It seems likely Iran at the very minimum would seize on a claim that Israel’s license to exist has been withdrawn.  In turn, if Israel interpreted the UN’s move as a an attack on its legitimacy as a state, it would be likely to interpret the move as having anti-Semitic overtones, strengthening the hands of those in Israel who see the UN as a stalking horse for anti-Semitism, and thereby reducing the UN’s ability to play a future role in resolving the conflict.