They were such mild mannered polite young men before the invasion.
If you believe that, I've got a bridge for sell. These fighters are the spiritual brothers in arms of the Saudis that flew aircraft into our buildings over 4 years ago.
"The vast majority of Saudi militants who entered Iraq were not terrorist sympathizers before the war, and were radicalized almost exclusively by the coalition invasion,"
And then they went to Iraq, where US soldiers sent many of them to meet Pimp Daddy Allah and experience his house of heavenly whores.