Immediately following the Six Day War, the Arab League convened in Khartoum and passed the famous three No's resolution: No to peace, no to recognition and no to negotiations with Israel. Meanwhile, Israel also had No's of its own: No to pulling back to the '67 borders and no to a Palestinian state.
There were some weighty considerations behind the decision to oppose the establishment of a Palestinian state that are still relevant today. It was a national consensus that only the radical Left contested. However, despite clear resistance to the establishment of a Palestinian state, Israel has in fact been integral to the advancement of such a state."