As an atheist, the bible is not my guidebook anymore, but the point I am trying to make is that the Watchtower has very little biblical basis for the way they practice shunning.
I gathered this was your point. I just fail to see how you've come to believe this is the case.
There are Muslims who believe the Koran is a book of peace, and tolerance. They'd never hurt anyone. They feel that ISIS has no basis in the Koran for their murderous actions.
Then there are Muslims who believe the Koran is a book that justifies ISIS, and encourages these murderous actions. These Muslims would kill the Muslims first mentioned. They don't see any basis in the Koran for shush passive beliefs.
My point is, you aren't making an effective argument. You're taking a book that can be interpreted countless different ways and interpreting it differently. That's all. From the perspective of a Jehovah's Witness the bible does justify shunning, and you cannot prove it doesn't.