“Since rising to prominence as an international menace, the Islamic State has tried to glorify its members, describing them as religious warriors who raised arms to protect fellow Sunni Muslims and serve their understanding of God. But the journey of Mr. Aboud, and his recruitment by ISIS, including with cash, departs from scripts emphasizing piety or civil defense.
It is the chronicle of an underground fighter maimed and darkened by his long fight, the biography — replete with rivalries and fratricide — of a proven and once popular Islamist commander whose actions turned more violent and vengeful as he moved into the Islamic State’s orbit.”
Source: Behind the Black Flag: The Recruitment of an ISIS Killer – The New York Times