I find the discussion about good and evil and how disbelieving people are that LL could do what she did quite surprising.
As I write this somewhere in this country or elsewhere in the world there will be people torturing and abusing other men, women and children - and getting pleasure from it. There will be people sitting at screens watching this happen and enjoying it. In comparison with that what LL did was almost benign. The babies had a short period of pain and then it was over. They didn't live to have the torture repeated over days or weeks or years, or have people pay to gloat over their pain.
We accept that people can be born with physical disabilities, why should people not be born with disabilities of the mind, not physical disabilities, but ones that make them incapable of empathy, or emotion, or indifferent to other people?
The reason, since time began, that societies have evolved moral codes - think the Ten Commandments, is because it was recognised that there were certain types of behaviour and actions that were considered to be beyond acceptable bounds and that there were people who would have no compunction in committing them - and murder was one of them.
LL is just a run of the mill serial murderer. That she was blonde, female and a nurse, doesn't stop her being a murderer. Lots fd murderers were ostensibly kind loving people.