This is a good start, to look at the common threads of this phenomenon as it arises in different political, cultural, and ideological settings.
Ex-skinhead, former Islamic radical open summit against extremism
Most panelists said there was no one event, or epiphany, which made them abandon their violent extremist groups, or join in the first place.
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And they agreed that it is the early process of recruitment, when potential members are young and looking for acceptance, that should be the focus on figuring out how to steer the next generation away from criminal or terrorist organizations.