The"Arab spring" seems to have been a mass movement that was not initiated by politicians. It eventually developed into a civil war in Syria and the emergence of ISIS. Common people, not just politicians, must share the blame because it was a mass movement. Now they all want to move to TO.
We don't have to guess what the effects of Muslim mass migration will be, because we can observe them in Europe. Those are the same people coming here. No good effects can be observed, only bad ones, too numerous to mention.