"We are only human..." --> Translates into "Your expectations and standards are unreasonably high."
The best question to ask is...
"What is a reasonable standard for someone who claims to be the sole channel of of hope from an all-powerful deity?"
If an all powerful god were truly leading someone, how !#^#%^& GOOD would their teaching actually be?
So we have a few explanations for the gap:
1) Jehovah does not exist, ergo Jehovah's Witnesses are wrong.
2) Jehovah does exist, yet has nothing to do with the governing body. Ergo...Jehovah's Witnesses are WRONG.
3) Jehovah exists and sufficiently directs the governing body. They willfully resist his direction. Ergo, Jehovah's Witnesses ARE WRONG!!!
4) Jehovah insufficiently directs the governing body for some reason, such as testing individuals, who should therefore not follow the governing body who is being used to test individual character because he would not test your obedience to men. Ergo, Jehovah's Witnesses are wrong.
It is logically impossible for a perfect god to insufficiently direct someone. Either god doesn't exist, is not directing the governing body, or the governing body is purposefully resisting him. They can not accidentally mistake direction. This is not logically possible. A perfect God would know exactly how much direction an individual would need to accurately convey information. If it were very important for him to have true beliefs spread, then logically he would do so.