Because...it won't take long for Hezballah to break the ceasefire...and all the world's awatchin' right now. Also, Immahdud in Iran is crazy and will overplay his hand.
Israel should flip the bird to the rest of the world and destroy Hezbollah...even if they have to march all the way to Beruit.
BTW, it was reported recently on FOXNEWS that the reason Haifa did not suffer any of the 80 rockets fired on Israel today was because Israel said if Haifa was struck, it would be open season on the tallest buildings in Beruit.