jw,
It is only the truth if it is true. If it is true it doesn't need to change, because truth doesn't become a lie—there is no such thing as present truth that is true. The doctrine of Jehovah's Witnesses changes, therefore it is not the truth.
That being established, we could call it guacamole, if we wanted...anything but "truth." See, declaring something "truth" doesn't make it truth. A man, Charles T. Russell, declared he had the truth. Jehovah's Witnesses have retained exactly two of his dozens of doctrines in an unaltered form. Another man, J.F. Rutherford, claimed he had the truth. We have retained six of his doctrines (of which all were contradiction of Russell's doctrines) in an unaltered form. He proclaimed scores of doctrines, and even changed many of his own before he went to live at Beth Sarim.
While J.F. Rutherford was still on top of things, a corporation became the channel for God's communications. "The Society" it was called, and it was responsible for feeding the elect. Doctrine from this new channel has been rewritten so many times there is no way to count them all. Later, the corporate heads of the Society became the first Governing Body—over whom the Faithful and Discreet Slave (per JW dogma) have no authority whatsoever.
That last bit is very odd, since Jesus said the Faithful and Discreet Slave would be appointed over all his belongings. I wonder whether the Governing Body belong to Jesus when the Faithful and Discreet Slave are obviously not appointed over them according to Organized to Do Jehovah's Will. (Matthew 24:45-47)
As it stands, there are scant few doctrines that have remained unaltered once arrived at. There are slightly more that have not been tossed out completely at least once. Each of these groups is tiny when compared to the pile of "truth" that has been cast off completely, or even labeled pagan and Satanic. An example of that last is the cornerstone of Russell's chronology: Pyramidology.
I understand you pretending that this was so long ago that such doctrines were bound to be wrong. But these same people so long ago arrived at 1914 (eventually) and distinct hopes for two groups of people. Why are you so certain they aren't also wrong about those doctrines? They changed a major doctrine in 1995 regarding the generation that saw 1914. People have died because of their "truth" regarding vaccines and organ transplants. Is "Oopsies!" good enough to cover bloodguilt?
If they had ever apologized for the lives lost because of their false doctrine on those points, I might have some shreds of respect for them, but they are callow children who want the world to work according to their rules. You mentioned that they humbly recognize their errors. Show me a reference where the ORGANIZATION has ever apologized for any wrong doctrine or the effects it had on the people who believed them. If you are right in your choice of religion, God will give you all the time you need. You'll be looking forever.
The organization has taken my family because they order families to cut themselves off from anyone who no longer believes the Governing Body tells the truth. If I seem bitter, keep that in mind.
AuldSoul