When I managed to get an Elder to talk at length about the Problem of Evil ,in the end he literally ran away down the street from me, saying over his shoulder "There is no answer !"
What I would have replied if he had stayed would have been something like "Using the Sherlock Holmes method, having discounted all possibilities bar one, the one you are left with is, however improbable, the answer, so the answer to the problem of evil is that the Universe is totally random and as my friends across the pond say "Sh*t Happens!".
But I never got the chance , it was as with most of the JW responses, a really silly conversation stopper.