It's fair enough to disagree, but I think the point being made is if God is good and he is all knowing and all powerful, then why does he allow evil to exist?

There are a lot of answers to that question, but the only one I can think of that allows for an omniscient & omnipotent god who is good is that the existence of evil must somehow, in a way beyond our understanding, be a benefit to the greater good. This can be a tough sell to the victims of that evil.