Nobody seems to get it. Just like the Iran-Iraq war, it it is in the USA's interest that no one wins this one. So, when one side goes a little too far, we intervene, but not too strongly. That way, the other side does not gain the ascendancy.
Just so that I'm clear here...are we talking Syria, or Egypt?!
Well,if you're headline challenged, the OP did say Syria.
Assad is in bed with Russia, Iran and Hezbollah. That's quite a foursome. If he wins this thing, he makes nothing but trouble for Israel, Jordan (our lone friend among the Arabs) and us. So we don't let him win. On the other hand, the rebels are being dominated more and more by Al Qaeda and the Muslim Brotherhood. The secularists are being shunted aside. If we let them win, they will turn and make trouble for...the usual suspects. So we don't let them win.