Our actions so far would qualify as a right thing. The world is not all black and white. Extremely complex situations cannot be broken down into "right" or "wrong". We are going in supporting the UN action, which may include boots on the ground from nations other than us. Diplomatically, it is a good thing for the US. Maybe not the best thing, but a good thing. Militarily, it is far from the worst thing we could do. For the rebels, it is hard to say.