Life Without Parole: Juvenile Edition

There is an ongoing debate in the Supreme Court, and the entire justice system for that matter, on whether sentencing juveniles to life without chance of parole is constitutional or not. Some say that LWOP can be considered cruel and unusual punishment, which is forbidden in the 8th amendment of the Constitution. Others say that kids who commit heinous crimes should be treated as adults, and tried as such. In my opinion, juveniles should never be sentenced to LWOP, neither should anyone I believe. LWOP should be abolished completely (except in special circumstances which I will cover later). My reasoning is that kids are very immature, irrational, and have not yet fully developed mentally to understand what exactly their actions constitute. Adults will almost always say that they are not the same person that they were when they were 16. So why should adults in prison who were sentenced while juveniles be kept in prison if they're not even of the same mindset as they were when they committed the crime? It's unjust to expect people never to change, and never give them the chance to reconcile with themselves. Parole is a chance for criminals to redeem themselves, and gives them the chance to assimilate back in to society as a productive, law-abiding citizen.
Kids are even more open to having a change of heart as they still have time to mature and grow mentally. So giving a kid LWOP robs them of that chance to reflect upon themselves and witness the error of their ways. Giving LWOP to anyone robs them of the chance to reconcile their crimes. But let's face it, some people cannot and will not redeem, reflect, or reconcile, and will never be able to join society as a good citizen. It's the job of the parole board to weed those who can't be good citizens out of those who can.
But what happens if someone commits a crime while on parole? In that case, they have committed the worse crime of all, betraying the trust and abusing the chance to live normally again. If this is the scenario, where someone on parole commits an equally terrible crime to the one that got them in jail, there will be no mercy for them. At that point, it's reasonable to sentence them to LWOP. Because after that chance has been spoiled, it should be obvious that they will never reconcile with their crimes, and they should never be given the chance to abuse the trust and responsibility placed on them again.