If, for whatever reason, a person comes to the conclusion that the Watchtower doesn't have authority to establish what Jehovah's Witnesses should teach then they should probably find a new religion.
Which is what most of us here have done. If only it were that simple.
Unfortunately, the Watchtower behaves like the "evil slave" and 'beats its brothers' by making false accusations against those who leave, and by enforcing unscriptural shunning against them. Frankly, if they didn't do those things, a lot of the people who post here would be a lot less angry with the organization than we are.
However, since those in charge of the Watchtower know that what they teach is not the truth and cannot stand up to open scrutiny, they use demonization and enforced shunning to silence those who have come to see the "man behind the curtain".
Tom
"The truth was obscure, too profound and too pure; to live it you had to explode." ---Bob Dylan