The United States doesn't have the will to work against al-Nusra or even ISIS, because they believe that this is a card they can use for their own agenda. If they attack al-Nusra or ISIS, they will lose a very important card regarding the situation in Syria.
Bashar al-AssadMany people, they flee not the war itself, but the consequences of the war, because they want to live, they want to have the basic needs for their livelihood, they don't have it. They have to flee these circumstances, not necessarily the security situation itself. So, you have different reasons for the people or the refugees to leave Syria.
Bashar al-Assad