A theodicy is not ad hoc

The reason is that the theodicy argument as proposed by atheists and ad hoc theorists is not true. Theodicy is asking why God may permit evil, the existence of evil itself is not an argument against God.

1. The existence of evil is an argument for theism based on the moral argument. If we concede that evil is in fact real (not just unpleasant) then theism is true.
2. This argues not solely for theism, but good theism, ie. a good God. This is because evil does not exist of itself, it is parasitic; evil is a perversion of good.
3. Therefore the existence of evil raises the question of why would a good God allow evil. The existence of evil does not raise the question of God's existence; rather his existence is proven by the existence of evil.