That is, if we assume that the inherent capacity to perform evil is itself imperfect. But how exactly does that follow? The fact that we can poorly use our free will exemplifies the fact that it is free. How is this an imperfection? Some may say that it is imperfect because the result is suffering, but then why is suffering imperfect? If you keep thinking in this line of reasoning, you will come to realize that a perfect God's creation, including His system of reward and punishment, must be perfect.