What about a car mechanic who gets it wrong?
An airline pilot?
Anything with little or no margin for error demands those doing the job have education, qualifications and practical experience.
Not so with WT or the GB because they are a religion and religions are free to make mistakes with impunity.
The "regulator" of religion at the end of the day is an individuals own internal bull shit meter -healthy human skepticism.
All religions are a public gullibility test.