I do not support our selective airstrikes. One of my reasons is if we solely focus on IS we can be seen as aiding Assad. We keep the gloves on for his civil war but we go after a faction which in opposition of his rule. If "we" defeat IS could this not net Assad a major victory as one of the largest opposition groups is now removed? It is these type of hand picked conflicts which caused a mess of the ME to begin with. We are also supporting the questionable actions of the Iraqi government thus legitimizing these acts in the international stage. This further pushes "us" from the "good guy" spectrum to "opportunists" in the eyes of many. From my point of view we can never win by being this selective while ignoring other factions or the acts of our supposed allies.
1) I no longer care how we are seen by anyone in the region. We are always going to be seen as the bad guys no matter what we do.
2) The airstrikes have not been in support of Assad. As far as I know, no airstrikes have targeted ISIL units that were engaging Assad's forces, they have been focused on preventing and/or slowing the advance of ISIL against the Kurds, Yezidis, and Iraqis. Which is a very noble cause in my opinion. A lot of ISIL slimeballs have been killed and a lot of minority groups have been saved from genocide already.
3) I cannot imagine that any of the Kurds, Yezidis, Assyrians, or Shia, anywhere near the frontline with ISIL would be against our airstrikes. And they are the only people that count in this. Not some random cynical Muslim complaining about Western intervention from his computer in his comfy house.
4) What are the questionable acts of the Iraqi government?
5) I do not trust either Assad or any of the rebel groups either. IMO the Kurds are the only progressive force in Syria, they are the only group we should be defending. So far that is more or less what Obama is doing, but his plan to train and fund rebel Islamist groups, that is the part of the plan that gets a bit iffy IMO...
The awful results of the Arab Spring suggest to me that the region is not yet ready for a transition to democracy. Perhaps the best Syria can hope for is a leader that can restore order and protect minority groups from being wiped out. I know Assad is a bad guy, but he seems like the best candidate for achieving those two limited goals.