The reason Israel must destroy Hamas this time is Iran

As Matthew Kroenig so brilliantly proved in his new book A Time to Attack: The Looming Iranian Nuclear Threat, the United States MUST attack the Iranian nuclear facilities if diplomacy fails. But Obama is quite reluctant to do even that which is imperative for the US. So it leaves Israel. The retaliatory strike that will follow an Israeli preemptive strike on Isfahan, Arak, Natanz and Qom will come from Iran, Hezbollah and Hamas. Israel has to get rid of the Hamas component in the Iranian retaliation. Israel has to neutralize Hamas NOW so that its part of the Iranian  retaliation will not  exist when the time comes to attack the Iranian nuclear facilities.