I'm not sure what your point is about a just war here is. To an extent, the point is moot; the war is happening right now whether we like it or not. We have no ability to simply decide whether or not it continues. Our only option along those lines would be to come in on one side or the other and force a conclusion.
Which brings us back to the Iranian thing. The rebellion is ongoing and has an excellent chance of success. Were we to come in and rescue Assad, we would be repeating our mistakes in Iran, except we'd be even dumber; at least the Shah was a good ally. Assad is nothing of the sort.
It is morally repugnant to support Assad, and politically suicidal as well.
And I don't know why you keep on talking about "right" in Syria. It's a brutal dictatorship where the government does what it wants and kills who it wants. People don't have a "right" to religion there, the government simply doesn't see any profit from oppressing people on that particular point. So while it's true that non-Muslims are not harassed by the government because of their religion, that is hardly because of any enlightened approach by the Baathists.