Syrian Rebels Beheading Christians

Please remind me why the U.S. is giving weapons to the Syrian rebels? We worry about firearms getting into the wrong hands here in the U.S., yet we are giving them to murderers in Syria.

http://www.cnn.com/2013/07/01/world/meast/syria-unrest/index.html?sr=fb070213catholicgroupmonkbeheading10a