They are advocating for self-worth to be intrinsic to oneself. The reason for this is the acknowledgement of at least 2 things: that every human is a victim of their starting circumstances, and the potential in every human being to alter their course in life. All the criminals you would be content to see disappear still were victims of the circumstances that led them there, and they all had potential to alter their course in life. You never know what stimulus life will offer you that can change everything for you. From a more utilitarian view, even criminals can possess very valuable skills that can be directed to constructive uses.