I don't understand why Israel hasn't started the ground invasion yet , time isn't on there side the longer the air campaign goes on the chances of the US telling them to stop increases. To quote Machiavelli “… in seizing a state, the attacker ought to examine closely all those injuries which are necessary, and to do them all at one stroke so as not to have to repeat them daily. Thus by not continually upsetting the people, he will be able to make them feel more secure, and win them over by benefits. He who does otherwise, either from reluctance or evil advice, is always forced to keep the knife in his hand. He cannot rely on his subjects, and they cannot attach themselves to him, because of the continued and repeated wrongs. Injuries ought to be done all at one time, so that, being tasted less, they offend less. Benefits ought to be given little by little, so that their flavour may last longer.”— Chapter VIII . Israel will quickly find the window for eliminating Hamas closed if they don't move faster than they are.