Syria is in different situation than Afghanistan or Iraq. There is civil war, not country against country. I think Obama don't want a war but he did not expect when he set the limit that someone use chemical weapon. Now he's slave of his own words.
Al-Asad is pro-western and don't want orthodox Muslim in power but most people in Syria is orthodox.
Al-Qaeda and United Arab Emirates also support rebel. And even UAE gives four times more money than USA.
I think if someone should do something with this it should be UAE.