I don’t expect them to behave in normal ways, because evidently they don’t. Killing a friend and mutilate the corpse in barbaric ways is not a normal behaviour, I would think. However, I expect their behaviour to respond to some twisted internal logic, because such is usually the case.
We know Calderas dated Steinfeld for a week. Presumably she did not plan the killing before starting dating as it would have been simpler and less obvious to not date at all.
Occam Razor actually suggests that Calderas dated somebody she perceived to be a woman and that she was a lesbian. Occam Razor also suggests that Steinfeld still had male sexual organs because Steinfeld just came out about gender dysphoria. Besides, at 17, Steinfeld may have been too young for surgery (not sure what is the legal age in Missouri, but a casual search shows that Missouri surgeons require one to be 18).
Possibly, Calderas strongly identified as a lesbian and was upset to discover that her new lover had male sexual organs.
I did not realise that, sorry. Post edited to comply.
