Israel can't risk that Hamas's new army (yes Virginia, trained troops armed with cutting edge weaponry working under the command of an elected civilian government is an army). Olmert's worst nightmare right now is allowing Gaza to become South Lebanon and Hamas to become Hezbollah. He's preparing the Israeli public for war:

Tomorrow's journalism today: when the war comes, the center will say that Israel is "complicating peace efforts" and the left will say that Olmert is trying to "mollify the Israeli public" after "what some see" as a "humiliating defeat in Lebanon". Little to no mention will be made of how Hamas is arming itself for an all-out war, preparing to use the same missiles and rockets that killed Israeli workers and schoolchildren during Lebanon II. Little to no mention will be made of how Hamas has been - explicitly, in full and proud view - violating every single peace agreement that the Palestinian ever made with Israel. No - as usual the center will complain and the left will spin pseudo-process stories so that their readers have conventional wisdom to sagely drop at cocktail parties and seminar rooms.