The defendant wants to hide the truth because he's generally guilty. The defense attorney's job is to make sure the jury does not arrive at that truth.
“Stand firm in your refusal to remain conscious during algebra. In real life, I assure you, there is no such thing as algebra.”
“I care very much what the fans think. I'm starting to loosen my grip on caring about what critics say, because I think that critics care about what fans think of them, too, so there's a little bit of a refraction there, through that glass.”