Well, as you know, the physical laws of this world allow the blockage of pain using some chemicals. So this is given.
Of course pain is allowed to be blocked, but it is usually not due to our own human constraints, e.g., the medicine can’t be afforded by the patient, isn’t available to the patient, or would have undesired side effects. The question is why God doesn’t simply snap his fingers and eliminate the pain when it serves no purpose.
Also, you’re ignoring the fact that knowledge of how to block pain
well is fairly recent in human history, so God has sat idly by and allowed senseless pain for at least millennia (I’m not sure if you’re a young earther or not).
Look how people sometimes cause harm to others when they are trying to get some good for themselves, or for those they love. In a world like this, suffering caused by others is possible even when there are no evil intentions involved. In your opinion, which set of physical laws could prevent such situations?
Firstly, a mortal’s inability to think of such a set of laws is no constraint on an omniscient being capable of arbitrarily complex calculations. God should be capable of anything logically possible. So unless an evil-free universe is logically contradictory, there shouldn’t be a problem.
I can conceive of simple universes in which it is possible to only ever be helpful or unhelpful, but never harmful. Think of a real-world Farmville (online game often played via Facebook) in which your options range from tediously watering your neighbors’ plants or focusing solely on your own. It is impossible to destroy others’ plants in Farmville. It would basically just serve as a test to see whether or not you have the empathy to help others even if it may bore you and not benefit you directly. Inject the players in this universe with an intense desire to have the best-looking farm–a desire comparable to, say, our sex drives–and presto, you even have drama in this universe.
Centuries ago some philosophers had the same dream: “with the right method, we will be able, in principle, to know everything”. The difference was that the mathematical models they were thinking of were deterministic, while your “one” thinks of probabilistic models. Now, as you say no body has been able to apply those probabilistic models to predict the behavior of an ant, so much the less to predict the behavior of a human being. I distinguish between physics and marketing, and those fantastic claims about the “in principle” predictive abilities of your “one” are not physics, but marketing (and not of the best quality).
This is a simple two-step argument. Do you believe every physical thing is reducible to particles and energy? Yes, any sane person does. Do particles and energy obey a mathematical set of physical laws? All signs point to “yes”. To say that a brain needn’t obey laws, you need to also doubt either the laws or the brain’s composition of particles. The fact that the laws are hard to apply in the case of the brain is not a counterargument, it is just an observation of our limited computing power.
Again, it’s hard to apply the laws directly to many phenomena. The swinging of a double pendulum is difficult to describe even though it obeys simple laws of Newtonian mechanics. The motion of 3 planets with mutual gravitational attraction was addressed only about a century ago. Nobody ever doubted the underlying laws just because these computations are difficult.