I don’t think she liked to see others happy because she didn’t have any happiness of her own. There’s been no texts to friends outside of work so it’s possible she didn’t have anyone else, no relationship of her own etc. some people go to extreme lengths to ruin things that others have.
Do you think those texts would have been included? Just curious- having said that they did use a text to her parents?
It’s really difficult to know what the triggers would have been.
I think when I saw the Shipman documentary he witnessed his Mum dying when he was about 17 - correct me if I’m wrong. So the theory is that was a trigger for him.
Somebody who is psychopathic doesn’t have the same emotions, feelings we have. Hence they feel no guilt or shame. So all they can do is mimick those feelings and emotions, some of them are extremely good at it. Hence why we hear about ‘that great guy who seemed so charming and normal ‘ turns out to be violent or a killer- Fred West was popular in his community, he had a very established building company, and people in the area used his services. Even when he was arrested the police found him amusing ! It’s far more complex than we realise. The reason they get away with it for so long is they know how to look harmless and trusting.