Remember what is most important to the Watchtower Society is "unity." They must have everyone unified in the same beliefs, the same rules, the same treatment. If they allow blood transfusions, then the ones who would have proudly and gladly died refusing blood transfusions will be stumbled. If they stop shunning, some will say, well I shunned my own child for 30 years and now you tell me it's OK to see them...then they will be stumbled. If they don't constantly have "new light" people will stop believing the Society has any "inside" connections with God, and so on and so on. They can't do much to save this mess they have gotten themselves into with their "teachings unique to Jehovah's Witnesses" that ALL MUST profess belief in.
A lie just gets messier and messier the longer it goes on and the more people start questioning it.
The Watchtower organisation is in serious trouble if you ask me. They cannot win for losing.
My sister and I left in our late 50's after being raised in. What a dramatic and sudden shift this was. It will be repeated thousands of times over until there is no one left but the try hard/die hards.