So you agree it can be effective depending on the circumstances. I disagree with you that it can only be effective on the get issue, but not on, lets say, tznius issues. Just as you say that perhaps he doesn’t want people to know he unjustifiably refused a get, and to get public humiliation as a result, I think (after trying private tochocho) public humiliation on this issue has a chance it may be effective on some if not many people.
I guess we’ll have to agree to disagree on its potential effectiveness.