The whole debate over arming the rebels has been stymied by not being able to arm only select factions.
It is difficult to tell one from another and there are complex alliance among various rebel groups. Many weapons sent to the rebels also show up at once on the black-market for sale. Some of the weapons earmarked for the rebels have also wound up in government hands or the hands of their allies.
You can say what you will about how it should be handled in theory, but in reality once you send the weapons across the border there is not telling who you are actually giving them to.
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