DEBKA had an article a few days back saying we (CIA?) recruited them to infilltrate al-queda and they turned on us (”double-agents”)....I think that is a highly likely scenario considering the free reign they were apperently given.
I am sure the CIA would not hire a 17 yr old. Two years ago the young one was only 17. And the older onee was an unstable nutcase even then, and was smoking pot and living the infidel life until just a few years ago, turned radical in IIRC 2009.
Of course I have no idea how/why/what the CIA does.