Something worth mentioning was that the teens and young adults were easy to trick.
A society with great social benefits allowed people to be fed without needing to work, but it could also kill a person's drive. Why would so many foolish people run to IS to become sex slaves and soldiers? People in most developing countries thought it was incomprehensible foolishness. But from a different perspective, most were searching for excitement to appease the adventurist spirit hidden in their genes.
Of course, Jiang Chen was recruiting agents, not terrorists.