The governing body and the Watchtower corporation argue that shunning is a scriptural requirement and a law of jehovah god.
This requirement of shunning applies equally to all who follow the bible or who are willing to recognize the religious freedom of jehovah's witnesses. Therefore all christians are permitted to shun jehovah's witnesses based on their own self-interpretation.
If shunning is a law in the bible then it applies to all, equally and fairly with no distinction.
If the prohibition on fornication is a law in the bible then it applies to all, equally and fairly with no destinction.
Consider: two humans have a dispute. They have the legal right to bring the dispute before the judicial authorities and courts for judgment. Do they also have the Divine Right to bring their dispute before jehovah god - or his representatives (governing body and their agents the judicial elders) - considering his kingdom is apparantly ruling? If they do not have this right to receive a judgment from jehovah god then neither does jehovah god have the right to judge them under any circumstance ... ever!
The nation of Israel was given the free choice of adopting god's laws, including the 10 commandments, when they were before Mt Sinai. They chose yes. Today mankind has been given no choice as to whether they accept god's laws. This is arbitrary with no freedom to chose. Therefore god's laws are null and void as theh have never been offerred and accepted.
If the laws of the bible, and the rendering of biblical justice, only apply to christians who are jehovah's witnesses then the laws, including fornication and the judgment associated with it, only applies to jehovah's witnesses. The world cannot be judged.
All jehovah's witnesses have the right to shun members as a disciplinary action. However, once the member is no longer a member the right to shun ceases. At that point it becomes the victimization and targetting of a former member or member of the community.