Hi Giordano,
I read the cases you link to. They are not the same. The shunning comes from the currently active members of the WT.
Rebecca Hancock had a case of slander until she went to Fox news and outed herself. She was persuing a relationship with a man out of marriage and her current church didn't like that. She terminated her membership, and the church decided it was going to present her wrongs publically to the congragation (probably read a list off one Sunday or something). As you know, JWs don't do this because it could turn to slander. Her case evaporated when she went to Fox news and confirmed everything was true on national TV. Again, she had the freedom to leave. She did. Good for her.
Marian Guinn vs Church of Christ Collinsville link: This is a case of a woman, Marian Guinn, who wanted to have a relationship with a man that the church didn't approve of. The church told her no, she quit. Again, freedom of assocation confirmed right there. But here is where it devates drastically from the WT: the church rejected her decision, then excommunicated her, and then went to all the local churches and told them what she had done. This was the problem. The WT is not doing this. They will either terminate their association, or the member will. Their policy of shunning applies to the rest of the currently active members, and they don't go around telling local churches the offenses of the former member, and they don't make the offenses public to the congregation.
MMM