A short comment, which is sub-titled 'Why bombing Syria could turn out to be a disasterous mistake' by Clints Watts:http://www.politico.com/magazine/sto...#ixzz3ESZPFEwU

A taster:
In other words, the United States could win some tactical victories by hitting both groups hard in Syria, but might be committing a massive strategic blunder by uniting a jihadi landscape it desperately sought to fracture over the past decade.