...because Obama accused Assad of using chemical weapons on his people (even tho evidence supported the idea that anti-Assad rebels did) and issued his infamous 'Red Line' ultimatum to Assad, believing NO One would dare oppose him.
Not having thought this through, when Assad supposedly did use chemical weapons again, the 'Nobel Peace Prize Winner' had no clue what to do ... so he backed down in front of the whole world, proving to our enemies (and allues) he was all talk ... which just emboldened our enemies.
Obama also hilariously did what he does best - he blamed THE WHOLE WORLD, calling his 'Red Line' THEIR 'Red Line'.
Sunce that embarassing failure he has been OBSESSED with Assad and making up for his disaster ... so much so that he crawled into bed with ISIS, who promised to fight Assad in a proxy war for him.
Obama has supplied, armed, and even trained ISIS. He protected their oil facilities and black market oil dealings with Turkey, which has funded 50% of ISIS' terrorist activites, which included their invasion of Iraq and terrorist attacks on France.
Obama seems to be willing to start WW3 in order to get Assad out of Syria. The only thing that seems more important to Obama than that seems to be the Global Warning scam that has and continues to promise to make a lot rich Liberals richer...