Yekke2, forget about the technicalities – isn’t he a “rodef” because we know how abuse ruins the victims’ lives? I don’t mean literally to Jill him, but shouldn’t we do whatever we can, including reporting to the authorities, to prevent him from hurting someone else?
I also don’t know why deterrence shouldn’t be in the same category. If locking him up will prevent others from abusing, that will save victims from untold agony, serving the same purpose as preventing him from repeating his crimes.