Hi Jon Preston, Until your wife stops using thought-stopping platitudes like "they were imperfect, but still the best people out there and closest to the truth", it won't matter how many times you prove that the WTBTS's leaders make mistakes.
How would your wife respond to something like the following?
"How many and what kinds of mistakes would the WTBTS need to make for you to become so skeptical of the WTBTS that you would stop making excuses for it? How come the GB/elders are imprefect men, but I would be shunned and you would be marked for not blindly following the WTBTS doctrines such as allowing our daugther to have fun by going to a birthday party? Although I enjoy spending time with our JW friends, how are they better than our non-JW family and friends who will not shun use for allowing our daughter to attend a birthday party.
Peace be with you and everyone, who you love,
Robert