Currently, the most popular way of defending the notion of an eternal torment is an appeal to creaturely freedom and to God's respect for its dignity, but there could scarcely be a poorer argument -- whether it's made crudely as by William Lane Craig or elegantly by Eleonore Stump, it is going to fail. It wouldn't if we could construct a metaphysics or phenomenology of the will's liberty that was purely voluntarist, purely spontaneous, though even then we would have to explain how an absolutely libertarian act, obedient to no rationale whatsoever, would be distinguishable from sheer chance or mindless organic or mechanical impulse, and so any more free than an earthquake or embolism. But on any cogent account, free will is a power inherently purposive, teleological, primordially oriented towards the good and shaped by that transcendental appetite to the degree that a soul can recognize the good for what it is. No one can freely will the evil as evil. One can take the evil for the good, but that doesn't alter the prior transcendental orientation that wakens all desire. To see the good truly is to desire it insatiably; not to desire it is not to have known it and so never having been free to choose it. It makes no more sense to say that God allows creatures to damn themselves out of his love for them, or his respect for their freedom, than to say that a father might reasonably allow his deranged child to thrust her face into a fire out of a tender regard for her moral autonomy.
-- David Bentley Hart