doubting bro I think it’s pretty easy actually to make the case that organisations that harm the public should not be given tax emeption or charitable status. (We wouldn’t want to support groups that promote self harm for example) That would seem a pretty basic and reasonable requirement for an organisation to receive any sort of support from society.
I also think it’s pretty easy to demonstrate that shunning is a harmful practice. Even Watchtower literature implicitly concedes this point, for instance when it talks frankly about the psychological pressure applied to people who lose all their friends and family. And when it talks about the heartache of disfellowshipping. (Blaming the victim of shunning for the situation, rather than the system of shunning itself of course)