In every case of wrongful conviction that I have come across, there are a number of common elements. They are, in no particular order, incompetent police work, prosecutorial misconduct, untruthful or deceptive testimony, and a jury system that assumes all defendants are guilty until proven innocent. This case has all of the above.
As bad as it is for innocent men and women to be wrongfully convicted, what happens afterwords is often even more tragic. For one, the people who made the mistakes that led to the wrongful convictions rarely admit to their errors. In fact, they go out of their way to suppress evidence, delay hearings, and whatever else it takes to keep the truth from getting out. Even when the truth is presented, they steadfastly hang on to their belief that the men are guilty.