If you want to be very, very mad, look up the story of Chester Weger, who was falsely convicted of the Starved Rock murders in 1960. The man spent 60 years in prison for a crime he didn't commit, and every single person involved in his botched trial is now dead and can't be punished. Despite all the exonerating evidence, the state of Illinois still refuses to vacate his conviction simply because of how bad it will make them look.