Okay, two points.
1. you support the doctrine with bible scriptures. When the WBTS didn't support organ transplant, jehovah witnesses then use the scriptures to show its wrong. But now you can accept organs. Didn't you think the bible says accepting organs is cannibalism and just plain wrong? Why the organization changed the doctrine?
2. 1 corinthians 5:11 did say do not associate with a person who claimed to be a believer but commit these sins listed in the scriptures. which in other words, is called a hypocrite. What does this scripture has to do with people that want to leave the organization? They are not hypocrites. They don't believe in the doctrines anymore. They are not going around claiming to be christians but commit these sins too. yes according to 1 corinthians 5:12 it saying why judge people on the outside but you don't judge people within your church? 1 corinthians 5:13 is saying that God will judge the people on the outside, just remove the wicked person from the church. It didn't say label the person as disfellowshipped and shun the person. In a sense you are cleansing the congregation, but shunning the person on the outside has nothing to do with cleansing the congregation.