I agree that there should be time served, and a significant amount of it. I’m okay with 15 years. This person needs to be set aside from society while we determine if we can help them and, if we can, to do it.
I’d like to know how we arrived at 15 years, though. Would 10 not be enough? If the court had suggested 20 I don’t think either of us would have said “But surely it can be done in 15.” It feels right but it looks kinda arbitrary and that’s interesting to me.