Query:

Is one "radicalized" by the government that they believe is oppressing them; or are they radicalized by the organization that comes along and offers them an alternative to that oppression?

As I always say, the Pied Piper is a fairy tale. If the conditions (real or perceived) of poor governance do not exist, no amount of leadership or ideology is going gain much traction with the populace.

Personally, I find the whole concept of "deradicalization" just one more blame shifting tactic to soothe ourlselves that we are merely victims here. This is not helpful, and it will not work.