Adamah:
I don't follow your logic, really. This is taken from the article (Conclusion):
No one nowadays can make a verifiable claim to possess equal authority as that of the apostles who interacted directly with Jesus Christ. Therefore, no one has the authority to modify or reverse what was written by the apostles or taught by Jesus, unless Jesus himself would unequivocally change his teachings. True, post-apostolic Christians often failed to show mercy towards those who departed from orthodox, dominant mainstream Christianity, but that doesn't negate the validity of the Scriptures. Modern Christians aren't bound by the mistakes of past Christians. They respond to Christ and God alone. As wisely put by Fulton J. Sheen: "Tolerance does not apply to truth or principles ... Tolerance applies only to persons, but never to truth. Intolerance applies only to truth, but never to persons. Tolerance applies to the erring; intolerance, to the error".
Perhaps this addresses your concern?
Yes, shunning isn't the same as stoning or burning someone, but it's excessively damaging and unconsistent with the teachings of Christ. Furthermore, I can't find in the apostolic writings anything that supports such treatment either. Later Christian writers, perhaps, but not the apostles.
Eden