JD: From the perspective of a Jehovah's Witness the bible does justify shunning
Only because they are TOLD that is what the bible says and what it means. This is the definition of indoctrination.
Are you aware that in 1947 the JW religion lambasted the RCC for its practice of excommunication? They called it ""an instrument by which the clergy attained a combination of
ecclesiastical power and secular tyranny that finds no parallel in
history."- Awake! January 8th, 1947, p. 27
The quote is on the right hand bottom of the page.