"We always wanted Bashar Assad to go, we always preferred the bad guys who weren't backed by Iran to the bad guys who were backed by Iran," [Israeli Ambassador Michael] Oren said in the interview, excerpted on Tuesday before its full publication on Friday. If you didn't catch that, basically he is saying Israel prefers an al Qaeda controlled Syria to an Assad controlled one because Assad has allegiances with Hezbollah. They believe, and rightly so, a Sunni controlled Syria is better for Israel.
More importantly, apparently so does President Obama, as he just waived the ban on supplying weapons to al Qaeda in order to clear the way for the U.S. to arm Syrian "rebels". National Security Council spokesman Caitlin Hayden released a statement confirming this after news of the waiver became public. 
This action also confirms President Obama and the federal government know that by arming Syrian "rebels" they are really arming al Qaeda. In fact, nearly 1 in 2 Syrian "rebels" (100,000 strong) are either members of al Qaeda (10,000) or consider themselves hard-line Islamists (35,000). An additional 30,000 fighters are members of Islamist organizations. If you include them, the number of Islamic radicals that comprise the Islamic rebellion is closer to 75% or 3 in 4.
Now, ask yourself if the US providing arms to those terrorists in order to topple Assad's government helps US interests or hurts them considering those same people were responsible for 9/11 and have been fighting our forces in Iraq and Afghanistan for more than 12 years. Not sure I can recall the last time Syria attacked attacked America or its forces abroad.
In fact, when Senator John McCain's "moderate" rebels stormed a Syrian city that was comprised primarily of Christians, it was Assad's Syrian government who came to their aid.
I will leave you with this to ponder, why would the most powerful people in the American government be putting the best interests of Israel, that happen to be in direct conflict with the best interests of the United States and their own people, first?