It’s much harder to know how to think about the young Friedrich Karl Bergers who stood silent while innocent people were worked to death on their watch, even if they have lived good lives in the years since. Neuroscience tells us that they deserve the same understanding as the young offenders sentenced to death row for drug violence, but I can’t seem to find any understanding in my heart for the young Nazis.Well, life isn’t fair, and we all know it, but justice is about doing our best to impose fairness in an unfair world. And the presence of the once-young Friedrich Karl Bergers among us — living a good life, causing no trouble, exacting no harm — impels us into an uncomfortable gray area. Somehow we must weigh the imperatives of justice against the imperatives of compassion for the heedlessness of youth.In that context, what happened to the Oak Ridge Nazi seems to me both far too little and also exactly right. No punishment can possibly restore to life the people who died in a concentration camp that Mr. Berger helped to guard, and exile in an assisted living facility is hardly fit recompense for such unspeakable crimes. But sending him to prison at the age of 95 for what he did as a teenager also seems wrong. Surely deportation from his home of more than 60 years is a fair penalty for a nonagenarian for whom prison could provide no possible rehabilitation.So which is it: real justice, or too little too late? I honestly don’t know.Margaret Renkl is a contributing opinion writer who covers flora, fauna, politics and culture in the American South. She is the author of the books “Late Migrations: A Natural History of Love and Loss” and the forthcoming “Graceland, At Last: And Other Essays From The New York Times.”The Times is committed to publishing a diversity of letters to the editor. We’d like to hear what you think about this or any of our articles. Here are some tips. And here’s our email: letters@nytimes.com.Follow The New York Times Opinion section on Facebook, Twitter (@NYTopinion) and Instagram.