I am afraid to say that if justice is not allowed to express herself, the innocent individual may serve the sentence of the real suspect, spend the rest of his or her life in prison, be put to death or die in prison. Sometime the suspect is never caught. You may think that is not fair, consider this; Justice will not force herself on anyone in order to make something right. Certain events, circumstances and so on have to happen for her to operate; she has to attach herself to something.
An example of justice, expressing herself is to make the wrong right. In other words, a new trial is ordered by the courts, and sometimes the once guilty person is pronounced innocent.