JWs shun those who disagree with them on the basis of some verses of apostles such as John and Paul. (2 John 10; Titus 3:10; 1 Corinthians 5:11; 16:22).
However, JWs do not realize that these writers are known for writing things that make NO SENSE at all. 1) John wrote: "No one has ascended into heaven, but He who descended from heaven: the Son of Man.” (John 3:13) While Jesus was talking to Nichedemus towards the beginning of his ministry, he had not ascended into heaven! Then why is such statement in the writings of John? Because he felt like putting them!
2) Paul wrote: “"If my falsehood enhances God's truthfulness and so increases his glory, why am I still condemned as a sinner?" (Romans 3:7) If he proudly and publicly believes that ‘falsehood can enhance truthfulness,’ what else can’t he write?
These writers are SIMPLY INCAPABLE of getting the sense of what Jesus himself said: “What do you think? If a man has a hundred sheep, and one of them has gone astray, does he not leave the ninety-nine on the mountains and go in search of the one that went astray?” (Mathew 18:2)
So what is the logic behind shunning those leaving JWs? NO LOGIC!