Even if evil is outweighed by the moral goodness of freewill, the evil is not eliminated. If a murderer freely kills a child, then a child is killed. All Christians should realise that their freewill has been bought with the blood of that child. They might say that their freewill is something good which outweighs the evil caused by the death of that child, but that does not get rid of the fact that children suffer. I wonder if Christians really believe that freewill outweighs any evil that may be committed by people exercising their freewill.
Actions speak louder than words.
There are few calls for criminals to be released because prison interferes with their free will to commit crime. If a Christian is attacked, he or she will try very hard to restrain the attacker, to ensure that the attacker is not free to commit evil upon them. When Christians teach each other the freewill defence to evil, they say it would be wrong for God to make us stronger, or make us wiser, or make us this or make us that, as that would turn us into little more than robots, pre-programmed to do good. According to Christian mythology, God has already created creatures who have always chosen good of their own free will. Angels Gabriel and Michael have never chosen evil.