How can a theist respond to the problem of evil in the specific case of mental illness?
If God is omniscient and omnipotent, he knows that mental illness causes suffering, and is able to prevent it, but chooses not to. For an omniscient, omnipotent, morally-perfect god to exist, there must be a morally justifying-reason to permit this suffering.
The usual theistic responses to the problem of evil do not seem to apply in the specific case of mental illness.
The free will defence fails because mental illness actually suppresses free will; therefore, if God really valued free will, he would prevent mental illness.
The soul-making theodicy fails because mental illness actually deprives sufferers of their ability to comprehend their existence in relation to God and His creation; therefore, if God really valued spiritual growth, He would prevent mental illness. It also won't do to say that the suffering of the mentally ill gives others the chance to be morally good, because the pharmaceutical companies...