The Assad dynasty helped kill 250 Marines in Beirut, I have no sympathy for them.
It isn't a question of sympathy. They are a duly elected government fighting against an insurrection on their own soil. The time to take them out was when the connection to the Barracks bombing was made.
We don't have a dog in the present fight, and another war where we end up assisting the Muslim Brotherhood in building their Caliphate really isn't something I'd like to see our troops sacrificed for.