Obama - "Mr Assad, we'll continue to let you do what you want, maybe give you a slap on the wrist every now and then, but if you use chemical weapons on your people, then we're going to kick your ass."
Assad - "OK Mr Obama!"
(couple of weeks later...)
Assad - "Hey Avi, I've got a great idea, crack out the Sarin gas!"
Is no one a little suspicious about that? Why would he essentially commit suicide when he was being allowed to continue what he was doing? Until there is irrefutable proof that he was responsible for the gas attacks, it's a rather flimsy footing to be launching another 'America Saves the Day' campaign.
Even though Assad is a dick, and does deserve to die.