I'm not going to try to answer this right now, as it is rather late here, and also, if I were to figure that out in a completely satisfactory manner, I'd probably be in 7D, not 3D! All I can think of at the moment is that from a very essential point of view, complete nothingness sounds like a massive contradiction, or as you say axj, an absurdity. Therefore there is something, which is everything. It's more an intuition than an actual argument, I know.Existence itself (as opposed to nothing existing at all) seems to be the biggest mystery of them all.
But I did want to say that this question often arises in my mind, "why Being instead of Nothing?", and usually my reaction is not so much to attempt an answer, but a huge sense of gratitude and wonder. Imagine the possibilites, everything is out there for the knowing and learning and loving, and, warts and all, here we ARE! What can be more miraculous than that? Even with all our shortcomings, as well as the evils and sufferings of the world, the fact that there is us, and there is a world and a Universe, is infinitely better than there being nothing at all. Not to mention that an 'eternity' of nothingness would be incredibly boring...