On the one hand, if we don’t offer much in the way of explanations, and just rebut argument against theism, appealing to mystery to avoid refutation, we nevertheless are left with weak position. The atheist can respond that the suffering in the world makes perfect sense on his own world-view, in that if there is no benevolent being in charge then the random distribution of pleasure and pain that we actually experience is pretty much to be expected.
On the other hand, if the theist explains too much, he runs the risk of hubris, or claiming to know what he is not in a position to know. He could find himself in the position of the comforters of Job.
Christian philosopher Daniel Howard-Snyder writes:
We do others a grievous disservice to hold out to them in private or in the pulpit any expectation to understand why God would permit so much evil or any particular instance, expectations which we have no reason to believe will be fulfilled, expectations which when left unfulfilled can become near irresistible grounds for rejecting the faith. We are in the dark here. We can’t see how any reason we know of, or the whole lot of them combined, would justify God n permitting so much horrible evil or any particular horror. We need to own up to that fact.
Daniel Howard-Snyder, “God Evil and Suffering,” in Michael Murray ed. Reason for the Hope Within (Grand Rapids: Eerdmans, 1999), p. 101.