Like it or not, Hamas is the most powerful organization in the occupied territories. It is deeply entrenched in Palestinian society. Neither Israel nor the Western powers can wish it away. The good news, if my reading is correct, is that Hamas has changed, is willing to meet some of the Quartet’s conditions and is making domestic political preparations for further changes. But if Hamas is not engaged, and if the siege of Gaza and Palestinian suffering continue without hope of ending the political impasse, there is a real danger of a regional war.