Yes, it's ironic that AB puts forward an idea of purposefulness, as if it contradicts our sense of cause and effect, whereas in fact, as torridon keeps saying, it can only flow from cause and effect. To intend something is to aim to bring about an effect, which is its purpose.
Also, the idea of intervening, which AB uses, indicates cause and effect, since if X intervenes in a situation, its with the intention again of creating an effect.
Well, AB is trying to say that there is a non-physical purpose, and a non-physical intervention, but he is no nearer demonstrating this.