The Free Will Defence for God
To justify the existence of evil and suffering, despite God being all powerful and benevolent, it is said that free will is of such high worth that it is worth the risk of us using it to create evil.
The argument against God
God, as all powerful, chose to create evil. God chose to create suffering, pain, misery... and it made it so that we could choose to accept these things and if we made bad choices these things could happen to us. It also made it more than possible for us to do evil and create suffering ourselves, it made it likely. But the existence of evil is not required for free will.