
Israel would not have acted in Gaza, could not have acted, without the overt and covert support of the United States. In effect this is an American war with Israel in the front line funded by the US. US Presidents as diverse as Carter and Trump (and everyone in-between) have not wavered in their support for Israel.
The Middle East is complicated, not least by the Sunni/Shia split in Islam. But there is nothing more designed, theoretically at least, to create unity than the opposition to Israel. Yes Iran, mainly a Persian not an Arab country and Shia, actually funds the Islamic terrorists and is extremist itself. But across the region there is no love lost between Persians and Arabs !
That the Israeli response to the Hamas attack was not proportionate is ever more obvious daily. As is the fact, admitted by senior Israelis, that the creation of a (much) “Greater Israel” is a goal. In other words the destruction of Palestine. The “Two State solution” is dead in the water. The gaining of Lebensraum is underway.
The Sunni countries, led by Saudi Arabia, are reasonably united and well armed. They don’t want war though and Israel is smart enough to confine its territorial ambitions to Gaza, the West Bank and Syria where, it seens, no Sunni State is going intervene.The reality is that only one country can restrain Israel. The United States. And they are not going to.