Bad thinking
NPR interviews some ex-ambassador type, now with some think tank. He says "The root cause of the humanitarian crisis in Syria is the
persistence of the Assad regime."
Incorrect. There wasn't a humanitarian crisis before the revolution started. In terms of per-capita income, Syria was poor but nowhere near desperate. Assad did not start the revolution. Thus the root cause is the rebellion.
In any warlike situation you have to ask "Who started this fight?" Sometimes the answer is chicken-and-egg-ish, as with the Zionists vs the Palestinians or Serbs vs Croats. In Syria there's no doubt. The rebels started the fight. After that, there was no exit.