They do not give thought to the character of prosecutors. Have you ever asked yourself what type of persons become prosecutors? Most Americans think a prosecutor is a person dedicated to serving justice and punishing criminals for their crimes. There are such people, but there are also ambitious prosecutors who pursue high conviction rates and high profile cases as a path to higher office. For these prosecutors, justice is a subsidiary concern. The worst kind of prosecutors are those who simply enjoy ruining people, whether innocent or guilty.

Prosecutors formerly were restrained by enculturation and a moral environment. Today the only restraint is their own character.

Miscarriages of justice have always occurred, but as Lawrence Stratton and I show in our book, The Tyranny of Good Intentions, miscarriages of justice are becoming the norm, not the exception. The Boston Marathon Bombing case is an example of a corrupt prosecution. See: http://www.paulcraigroberts.org/2016/03/29/update-on-the-boston-marathon-bomb-case-paul-craig-roberts/

Once a miscarriage of justice occurs, it is almost impossible to reverse it.