This is no moral reason for our involvement here. None.
Well, actually, we do owe the runt King of Jordan a few favors. He helped us immensely in getting to Saddam and putting up with Iraqi refugees just to note an example of his recent helpfulness. Now he has a huge problem with Syrian refugees and Basher has been trying to kill them on their way to Jordan. So far the plan as I can read it is more to help Jordan defend itself than to beat Basher’s teeth in——yeah, it’s not our fight but we do the little guy for past help.