An additional line of reasoning by the Watchtower Society to justify their errors (and which it's members have learned to parrot) is to make a comparison to the Apostles and the mistakes that they made.
Reasoning from the Scriptures p.136 "Like the apostles of Jesus Christ, they have at times had some wrong expectations.-Luke 19:11; Acts 1:6".
This addresses an issue quite different to the one at hand. No one questions that individual Jehovah's Witnesses or even individual members of the Governing Body have to be perfect. The issue is whether the Governing Body operates under guidance of Jehovah and His Holy Spirit as a collective group. Does Jehovah direct what appears in the Watchtower journals?
Rather than suggesting that Apostles made mistakes ask "What percentage of the Apostles writings in the Bible are wrong?" Zero percent. "What percentage of Watchtower statements has been wrong?" The difference being that God's servants were directed by God, the Governing Body is not.
Pay Attention to Yourself and to All The Flock p.13 tells us;
"Today, Jehovah provides instruction by means of "the faithful steward." Why then is it that when the Watchtower Governing Body relies on Jehovah they have regularly been wrong? How can they pray for Jehovah's Holy Spirit on a decision or doctrine, publish it in the Watchtower, say it is to be accepted as the 'voice of God', and then later discard it as incorrect?
They are, in effect, saying that Jehovah is wrong. Jehovah made a mistake.
The Watchtower reliance on the 'new light' doctrine is no more than an excuse to justify inaccuracies. "New light" is an unhealthy concept that promotes blind, unquestioning devotion to an earthly Organization.
Watchtower changes include numerous false dates, changes of significant doctrine and the promotion of pagan symbols and teachings. Rules on shunning, medical advice and education have been adversely life changing, and have even lead to many deaths.
Deuteronomy 18:22 provides a foolproof way to determine if words being spoken have come from God; "the word [that] does not occur or come true, that is the word that Jehovah did not speak".
Ongoing doctrinal meandering can not be justified as new light; rather it is proof that God does not direct the Watchtower Society. The Bible does not make room for error; falsehood does not originate from Jehovah.