Along the same line of thought I think that seeing people's lives going to shambles after they leave the Borg as being one of the strongest indoctrination tactics that the Borg has.
Recently a 50ish year old dub from a large family told me that the two brothers of his who left the "truth" lives are in shambles. And he is right. Their lives are a wreck. The rest of the family whom are witnesses have pretty good family lives. This is solid evidence to the rest of the family that being a witness is the best way of life.