It was after the assesment you mentioned thatObama turned his back on the Syrian patriots and the others in the coalition and jst backed out.
There s no defending Obama. He is a villian
The Syrian patriots, or moderate rebels or whatever you wan to call them were a stalking horse for the jihadists.
The effort ultimately failed because Russia intervened and the US doesnt want to start WW3 just to replace the Syrian dictator (wisely!)