Actually I think people should have open discussion about all subjects because it does cause growth. However, as you can read for yourself in most post (not all) people are proving a point they are not asking or searching.
I don't believe the bible is unlocked if you have a point to prove nether did Christ. I think most people that have come to be JW's did so to be right in every bible discussion rathers then seeking God's well in their life. From that stand point it about winning a war it about using knowledge to feel superior. When one does that if they can be honest with themselves they lack faith in God's promises - their faith is fear based they are trying to save their soul by scriptures correctness. Thus, viewing God as a man that must produce a perfect binding contract.
We often look to trends of a common thread to connect truths of life. I suggest that a clear thinking person must see the common tread of confusion and opinionated people on doctrinal issues among Christain. One must concluded if eternal life depended on the perfect interpretation of scriptures then all the Christian for two thousands years did not make it. I don't believe that for one minute nor do I think God is that small to read doctrine rather then the hearts of men. The heart of men can change from good to bad over doctirnal debate.
The Bible was written intentionally ambigious and insufficient
So that we would turn to God and trust Him instead of men
Moreover, those that have left the JW"s and were shown they were wrong that they have been decieved should see the same common thread in all organizations. Furthermore, if a Christian has God's Spirit God will lead them and give them the correct answer to things pertaining to their faith.
Most often debating dogma does not produce good for the listener searching for the truth it over turns those listening and stumbles weak Christain or inforces the idea fighting about the bible is what God people are all about.