The evil in the world

Have you ever addressed Leibniz's question, "If God exists, is good, and is omnipotent, how can there be evil in the world?"
The answer "it depends on the choice of the wicked" is not sufficient, because he is talking about natural evil, for example, how can it be that an innocent and good person falls into a pit and dies? How can it be that an innocent baby is born blind?