I'm sure many of you are familiar with that line. It continues to be a card played frequently by the WT Society.
Is there any truth to it? "Apostates" do tend to tear down. But I think Robert G. Ingersoll (per wiki... a Civil War veteran, American political leader, and orator during the Golden Age of Freethought) gave the charge some perspective and answered it beautifully. But bear in mind, he had no relationship to the WTS at all - he was replying to rants against his agnostic views. Still, this is the best response I've ever heard to that charge:
Interviewer: The great objection to your teaching urged by your enemies is that you constantly tear down, and never build up.
Ingersoll: ...."A destroyer of weeds, thistles, and thorns is a benefactor, whether he soweth grain or not." I cannot for my life see why one should be charged with tearing down and not rebuilding simply because he exposes a sham, or detects a lie. I do not feel under any obligation to build something in the place of a detected falsehood. All I think I am under obligation to put in the place of a detected lie is the detection.
Most religionists talk as if mistakes were valuable things and they did not wish to part with them without a consideration. Just how much they regard lies worth a dozen I do not know. If the price is reasonable I am perfectly willing to give it, rather than to see them live and give their lives to the defense of delusions.
[edit: removed latter half of answer as it pertains more to his agnostic views]
(BTW, I'd like to thank LeavingWT - who is currently taking a post break from JWN - for first tipping me off to Ingersoll's writings. All of his texts can be found online and also on iBooks for free download.)