How do paragraph 18-21 contribute to the author’s discussion about the supreme court ruling against mandatory life sentences for juveniles. The text: Chief Justice John G. Roberts Jr., in a dissent joined by Justices Antonin Scalia, Clarence Thomas and Samuel A. Alito Jr., said the court was confusing decency with leniency. He added that longer and mandatory sentences had developed only since the 1980s, making it hard to argue that abolishing them was part of the country's evolving standards of decency. "It is a great tragedy when a juvenile commits murder - most of all for the innocent victims." Chief Justice Roberts wrote. "But also for the murderer, whose life has gone so wrong so early. And for society as well, which has lost one or more of its members to deliberate violence, and must harshly punish another." 20) 4 In a separate dissent read from the berich, an unusual move indicating deep disagreement with the majority opinion, Justice Alito made a similar case in stronger language. "Even a 17 %-year-old who sets off a bomb in a crowded mall or guns down a dozen students and teachers is a 'child' and must be given a chance to persuade a judge to permit his release into society," he wrote of the consequences of the majority ruling. "Nothing in the Constitution supports this arrogation of legislative authority."