I guess they had enough girls to rape, but they need more mighty warrior murderer/rapists. Just their version of a complete K12 education, brought to you courtesy of Islam, the 'religion of peace'.
'Islamic State militants beat Kurdish children as young as 14 with cables, forced them to watch videos of IS beheadings and made them intensively learn the Koran during months of captivity, Human Rights Watch reports, saying it amounts to war crime.
http://rt.com/news/202195-is-tortured-child-hostages/
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