Truth or a Easy Way Out?

                 I was reading about the most notorious serial killer of them all and I bet you can guess who. None other than Jeffrey Dahmer. I was reading the internet article, "Jeffrey Dahmer-Serial Killer and Cannibal", by Marilyn Bardsley.  It was so sickening that I had to turn my head as I was trying to press the thought out of my mind when I read, "He strangle the asian boy and had sex with his corpse". The boy was only fourteen years old. He was, eventually, caught when the police saw a black man running down the street in handcuffs and he explained how Jeffrey tried to attack him at his apartment. The police went back to Jeffrey apartment and discovered pictures of various victims in his room and severed heads in the freezer. In total he killed and mutilated 15 people. I learned that his defense was insanity. His attorney explanation was that something is psychologically wrong with him and that he had no control over what he did. There are some serial killers who, I believe, had psychological issues.
              One, I believe, to have suffered psychological issues is Arnold Sodeman, who murdered four little girls. I know he murdered four little girls but first please hear me out and then make your own assumptions. I was reading from the website http://www.murderpedia.org/male.S/s/sodeman-arnold.htm and discovered his mother suffered from amnesia, also his father and grandfather died in mental institutions. He confessed to the murders willingly and at first the police didn't believe him until he told them what was the last thing the little girls ate before they died, which was something only the killer would know. He didn't want to reprieve, or to cancel or postpone his punishment, because he feared that he would kill again. Before his execution as quoted from the website, http://www.murderpedia.org/male.S/s/sodeman-arnold.htm, he said "I'm gald it is nearly over". His autopsy showed he suffered from chronic lepto-meningitis, which is inflammation of the brain after the intake of alcohol. It was later discovered that he was intoxicated during each murder. Do you think that either one of these killers suffered from a psychological issue and that it was their true purpose for killing or is it a easy way out?