I've been reading Nicolas Taleb's book
http://en.wikipedia.org/wiki/Antifragile:_Things_That_Gain_from_Disorder
The concept of anti-fragile definitely applies to disfellowshipping. Although on the face of it, it appears to be a disturbing negative event, and one that JW's believe to be disciplinary in nature - in fact it frequently has a strengthening effect opposite to the intended outcome.
If you have benefited from being DF'd - you are anti-fragile. An attempt to break you has failed AND has improved you as a person.
Thank you Watch Tower :-)
(and thanks Paul - again)