Apparently the Comptroller of the Currency has made money transfers to Somalia illegal out of fear that the money will go to al-Shebaab. George Monbiot calls out the fallacies in this policy in the following article: http://www.monbiot.com/2015/02/10/unremitting-pain/
He makes the case far better than anything I would write.
The people of Somalia need aid in combating a multitude of ills, including internal terrorism. They cannot do it without our help. Choking them off in this way is stupid.