What do you think about the comment: Bringing out the truth would mean punishing someone who is essentially good. What does this mean abaout the law?

This means the law should not be absolute. There are times, like in the case of Boo Radley, when changing the truth is better for all concerned. The benefits of keeping Boo Radley out of the spotlight outweigh putting Boo Radley through the publicity which would surely destroy the reclusive man.