I think the most likely candidate for a first cause are the laws of physics themselves. I don't think a mind makes much sense at all since the nature of a mind involves incredible, evolved complexity, and as we work backwards in the chain of causation things get simpler and more fundamental.
Yes, I have heard about the kinder, gentler hell. But, even short of physical torture, are those who are separated from God not suffering? Are they not feeling the anguish of God's absence and the pain of regret? Or are they perfectly happy in Hell? Even a small amount of suffering, stretched out over eternity, is monstrous. After all, having a little bit of water dripped on your forehead is no big deal. Having it dripped on your forehead for 48 hours straight is torture. There are obviously no lessons being taught in Hell, since an eternal condition makes such a "teaching" irrelevant.
CS Lewis asks, "What are you asking God to do?" Even if we grant that those in Hell have rejected God of their own free will, it seems annihilating the rejectors would be a far better option than Hell. I have heard the argument that God can't annihilate souls since they are immortal. I find this to be a strange check on God's omnipotence, but even if that's true, why couldn't he just put the souls into some kind of eternal, unconscious slumber? Somehow, the only the option for an omnipotent, all-good God is to inflict eternal suffering on billions.
