The humor is essentially dark for a cartoon and sophisticated. But at the same time being a cartoon gives the writers more freedom than in a normal sitcom. It always pushes the line that despite human failings the Simpsons are really decent people.
And that's the mission of The Innocence Project in New York is to exonerate people who have been wrongfully convicted and also work from a policy angle with Congress and state legislatures to prevent future wrongful convictions.