Two decades later, it’s easy to look back in judgment, but it would be a mistake to think the nation has fully moved beyond that mind-set. Many states continue to punish juveniles as harshly as they can, even though the Supreme Court has held in a series of landmark rulings since 2005 that young people are “constitutionally different” from adults.

In a 2012 case, Miller v. Alabama, the court ruled that juveniles may not receive a mandatory sentence of life without parole, because it prevents judges from considering the “hallmark features” of youth — including “immaturity, impetuosity, and failure to appreciate risks and consequences.” Recognizing that younger offenders have a greater capacity for change, the court required that judges give them “individualized” sentencing decisions and, except in extremely rare cases, a “meaningful opportunity” for release “based on demonstrated maturity and rehabilitation.”

Some states have taken the court’s rulings, and its reasoning, to heart. Since the ruling in Miller, five states have abolished juvenile life without parole in all cases. In March, West Virginia lawmakers passed a bipartisan bill that provides parole review for any juvenile who serves at least 15 years in adult prisons. Similar legislation is pending in Connecticut and Hawaii.

But other states keep fighting to prevent their juvenile offenders from ever having the chance to see the light of day. Michigan now gives judges the “choice” of imposing a minimum sentence of 25 to 60 years instead of life without parole. Courts in other states have refused to apply the Supreme Court’s ruling retroactively, stranding many of the more than 2,000 inmates who were sentenced before the Miller decision.

The issue is not, as supporters of mandatory sentencing would have it, about going easy on criminals. No one is ordering judges to release inmates who are not rehabilitated, or who pose a threat to society. Rather, it is about giving legal meaning to the neurological, psychological and emotional vulnerabilities of young people. Those who make mistakes — even terrible ones — should not be sentenced to die in prison.