Ludwig has it - it's a cult. ~Remember 'Moonies' et al? These youngsters (and some oldies) are being sold 'certaincies' in an uncertain world. In the UK this is exacerbated by a 'them and us' feeling caused by their parents' generation's inability to adopt, or even adapt to, the culture of the nation to which they have immigrated. They need to belong somewhere - ISIL offers certaincies and roles in life. Not everyone recognises or appreciates freedom to carve their own way. Phew! :)