They have been warned several dozen numerous times to stop the flow of terrorists into Iraq.
They were warned several dozen numerous times to quit screwing with Lebanon.
There has been enough warnings already and it is time for the actions to start.
We don't have to go "military" at this point. UN economic sanctions will cripple the country and I suggest we start there now.
Syria has no friends anymore (maybe the Russians will extract a price for their vote at the Security Council but that is it.)