We are dealing with this shunning as well. You know that phone call you get from the family member, and they try to get you to go back to the meetings because "deep down you know its the right thing to do"? Well, we got one of those yesterday.
I used to agree with the shunning, it made since. By shunning the person, you make him/her feel so badly and miss you so much, that he/she has no other choice than to come back into the fold, and fall into line with the rules. Justice wins, all is well, and thru tough love, you saved a life, right? right?
However, now, if I look at it the way "God" is supposed to see it, when shunning works...does it?? No. The person goes back only to appease his family/friends, not because of his "heart condition" missing "the love and protection of the Organization".
Forcing a friend or family member back into the organization by shunning does not really solve the problem. I think huge love bombs would help more. Perhaps patiently waiting on the persons attitude to change, showing only love and warmth, as a family should, would work more effectively. But that won't happen any time soon.