How the U.S. fragmented Syria’s rebels"A hesitant U.S. role was central to the fragmentation and radicalization of the opposition. Particularly to blame are the combined failures to coordinate the actions of other pro-opposition states, to provide timely financial and military support to the opposition, and to use military support to produce qualitative changes in the opposition’s capabilities vis-à-vis the regime.
Such a causal story offers a different reading of ISIS’s swift organization of a militarily effective force, its barbaric violence and its consolidation of territory from Syria into northern Iraq. While the rise of ISIS might appear to confirm the worst fears of those who argued that the United States should not support the armed Syrian opposition, in fact it shows the opposite."