Well, this is a standard strawman argument.
There are two factors that make errors and changing doctrine by the Watchtower Bible and Tract Society both wrong and evil, and beyond the errors and blind alleys, say, that the scientific community can be challenged on.
Ethos, would you agree with these two statements?
- The Watchtower society claims to be the organization most closely led by Jehovah's Holy Spirit in our day, indeed, the only one.
- Remaining close to the society offers the chance for eternal life, and rejecting the society or being rejected by it means certain death.
Given that you agree with these two statements, every statement made by the WTS has life or death import. As human as the writers may be, their claim is that they are speaking on behalf of Jehovah himself. To find human errors challenges this most extraordinary claim, and perhaps can help the discerning reader determine if the WTS is spirit-led or not.
Another rather obvious example that the WTS is not spirit-led, are the examples of flip-flops. Jehovah does not change His mind, but the Governing Body does. Some of these doctrinal changes led faithful Witnesses to life-threatening decisions, such as refusing an organ transplant. A faithful Witness obeying instructions before the doctrinal change dies a premature death, the next, deciding after the change, lives.
Next, I'll talk about allowable errors in the scientific community.