He doesn't need to use attorney tactics. His message alone is persuasive enough for you to feel sympathy for him. He pleads his case against God honestly, for he honestly believes in his own righteousness. This is the classical portrayal of the human predicament as a constant battle between good and evil in a nutshell; if the distinction between true good and evil was so clear, people would not feel compelled, even justified, to do evil.
But this is a literary observation, not the point of the thread, which you may have missed.