ElderBerry: as if you have the truth and you know everyone else is wrong?
That's not what he is saying. If the WTS does not live up to its stated ideals, then it is wrong. If a group of men claim to have god's explicit support, but their words and actions don't show it, then it is natural to want to avoid them. This has nothing to do with whether the ultimate truths about the universe are knowable.
Not knowing the ultimate answer is no reason to accept bad explanations.