Simply put, he prefers Iran over Israel:

The fact that Obama has adopted a Lindberghian policy doesn’t mean that in this new context he is not being realistic. The worrisome reality is that the relative strengths in the much-discussed, historical hostility between Sunnis and Shiites in the Middle East, are not balanced, this according to a reliable security source with access to intelligence data. Syria is the main area for this struggle and what the US and Israel see is that the Shiites, backed by Iran, are a solid power with the ability to control and carry out a clear policy.

In contrast, the Sunnis do not have any real power at this point. They are fragmented. The Syrian opposition has not proved that it is internally cohesive and can control and keep order in major sections of Syria, let alone in Iraq. They were unable to retain power even in Egypt, where the Muslim Brotherhood won control. So the Americans handed over Iraq, Syria and Lebanon to Iran.

There is no doubt that Preisdent Obama knows very well that he is turning into a partner of leaders who have committed crimes against humanity and a friend of those who declare their intentions of doing so. No problem. He simply prefers Iran over Israel.

It does seem a theory that best fits the evidence.