Inside the Mind of Ariel Castro

Cleveland kidnapper says he is sick, addicted to porn, but "not a monster."
3:09 | 08/01/13

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Transcript for Inside the Mind of Ariel Castro
The judge, as you know, said that michelle knight showed remarkable strength when she listened to ariel castro talking about his unhappiness. WE ASKED cynthia McFadden to take us inside the mind of an abuser. Reporter: Ariel castro took advantage of his right to speak today. For 16 minutes he went between pity and poll ji, defiant. Through it all, stunning dill lugs. Most of the sex that went on in the house and probably all of it was con sensual. Reporter: He said he is repeatedly not violent, not a monster. He called himself a victim, saying as a child he had been sexually assaulted and addicted to important. The judge made short of that. Castro is right about one thing. He is a sick man. Is ariel castro a sick man or evil? He himself seems accused about that and societying as well. He has some sort of sexual disorder. He describes the fact that he feels driven by a force he doesn't fully understand. Reporter: If he's so sick, how did he go undeteblthd all those years? What all of us are concerned about is he's a very good liar. Reporter: Being mentally ill does not mean he is not legally responsible. Legal insanity is a very high bar used in only one percent of cases and experts say not applicable here. A RELATIVE OF gina DeJesus also spoke today. Ariel castro -- Reporter: Looking ariel castro straight in the eye, may god have mercy on your soul. I want to bring in abc's chief legal analyst, dan abrams. Dan, he pled guilty but proceeded to try to deny what he pled to. Does the judge have to let him do this? The judge has to let him speak, the judge has to give him an opportunity to say anything that could lead to a more lenient sentence. The judge may have been able to step in earlier but the bottom line is this guy has a very distorted view of the world. Everything he said seemed to be intended to ingender sympathy from the court and the people watching and yet, everything he said seemed to back fire. Everything seemed to make it worse for him. When he goes to prison now for life, is he a target of other prisoners? Absolutely. The first thing that's going to happen is he's going to be held in solitary confinement. Everyone in ohio who is a male sex offender goes to a particular prison. No question, he's going to have to be held in solitary confinement not as a punishment but to protect him from other prisoners. This is the rest of his life for sure. Yes. Dan abrams, again our thanks

This transcript has been automatically generated and may not be 100% accurate.

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