Personality disorders have an early onset and have life-long patterns. Psychological and medical treatments are rarely effective. There is line somewhere between what people are and medical condition. When stress response or something goes awry in the young age, it may be impossible to reverse it or treat it. It's what person is.

Same person can be both victim and criminal. Criminals typically have impulse control problems and punishment don't work as effective deterrent.

This is why criminology and criminal justice systems in Nordic countries puts less weight on punishment. Separating criminals, partial rehabilitation or wearing them out in the system is best that criminal system can do. What people 'deserve' is just revenge seeking and vulgar attitude. It's probably rooted to religious belief in a soul.