The phenomenon of legal ethics: Many people think that ethical behavior will not violate the law, but in reality, certain behaviors that conform to general moral principles are prohibited by law. Which of the following is not a "legal anti-moral phenomenon"? ["A nurse, out of sympathy, responded to an advanced cancer patient's own request to assist him in euthanasia to relieve his unbearable pain, and was subsequently charged with murder.", 'A Jia spent 10,000 yuan to buy a boy as a child from a trafficker. It was regarded as his own, and he showed great care. When the police came to "rescue" two years later, the child was reluctant to leave the current "parents. ".', "In order to solve the difficulty for migrant workers' children to go to school, B set up a low-cost primary school and was accused of illegally running a school. Many children were again out of school.", 'After he was released from prison and returned to his hometown, he threatened to retaliate against the "enemies" and prepared a murder weapon. After his father dissuaded him from invalidating him, he was bound and held at home for three months in order to prevent him from committing a crime.']