That's understandable. And I agree on a personal level, to some extent. People make their choices and it reveals their character. It's hard to forgive and forget, even if they later change their mind.
What I mean is it would be good in general if JWs stopped the practice of shunning. It wouldn't undo past hurt but it would stop future JWs and former JWs from suffering the same. Surely that's a good thing.