It's so contrary to biblical record that Watchtower leadership suggests disfellowshipped persons be treated as though dead (like persons stoned to death by fellow Jews!).
According to biblical record early Christians knew what it was to be stoned to death. Many suffered this sort of death, and if we beleive the biblical record some survived the ordeal. Back in those days stoning was apparently "legal" and was carried out publicly as a result. Yet we see nothing in scripture of early Christians disfellowshipping individuals by killing them, as though Christian shunning should be compared with death by communal killing.
My best guess is early Christians would be aghast at Watchtower suggesting the sort of shunning they carried out should be compared with what the larger Jewish community of the day did to them in the way of death by communal killing.
Things done in the name of religion never cease to astound me. Recently I observed a small child of about 6-10 years old recorded on news footage explaining why children murdered by Islamic extremists was a good thing. He said, "No matter age, apostates deserve to die." That boy didn't come into the world thinking like that. The local religion taught him that hate.