Yesterday brought the shocking news of the murder of the US Ambassador to Libya, Christopher Stevens, by a Moslem mob in Benghazi, Libya.  The site of the murder is significant:  Benghazi was the stronghold of the rebellion against Moammar Khadafy, a rebellion that succeeded only because of help from the United States.  Stevens’ murder brought home a point that should have been evident far earlier:  the United States should not be assisting the forces of the so-called Arab Spring.   What possible sense does it make to arm and finance people who hate us and want to kill us?