 Why did Joe want to commit a crime and be caught by the CPA?
A civilization weary of murder, robbery, kidnapping, counterfeiting, blackmail, rape, arson, and drunkenness had originated the CPA—Crime Prevention Association. There were no longer any prisons—CPA officials had declared loudly and emphatically that their job was to prevent crime, not punish it. Instead, he was sent to a hospital where all criminal tendencies were removed from his mind by psychologists, shock treatments, encephalographic devices, a form of prefrontal lobotomy and a dozen other methods. The CPA system was, actually, cheaper than previous methods because it did away with the damage caused by countless crimes; did away with prisons and their guards, large police forces, squad cars and weapons. He was a hero to the millions of men and women who had suppressed impulses to kill someone, beat their mates, get drunk, or kick a dog. Not only a hero, but because of the CPA Treatment, he was—when he left one of the CPA hospitals—a thoroughly honest and hard-working individual ... a man who could be trusted with any responsibility, any amount of money. A crime because it theoretically inflicted psychological injury upon the intended victim—and because millions of women voters had voted it a crime. On the other hand, attempted murder, robbery, kidnapping, etc., were not crimes. They weren't crimes because the DCT didn't complete the act, and if he didn't complete the act, that meant simply that the CPA had once again functioned properly.
 So that he could receive the CPA Treatment and be offered a good job.
 So that he would fit the part of a hardened criminal.  So that he could become a part of the CPA team.  So that he could receive the CPA Treatment and be offered a good job.  So that he could get into the prison.