"It's my body and I can do what I want" is what everyone says when they're young. And if YOU don't want to help them, yeah, that's your choice.
In a general sense, I do the same thing. I don't stop on the street and try to help alcoholic bums even though I theoretically could. But if one was convulsing in seizures while vomiting, I would. If I can help someone to stay alive, no matter where I am or what I'm doing, I will consider it. If I'm hiking up the Himalayas and I risk my life by simply going back, I might not do it for my own self-preservation. But if there is any reasonable opportunity to help someone in desperate need, I consider it my human obligation to help them in the situation.
Translate this to fat ugly jail guards and their stupid fat nurse completely ignoring a convulsing, seizure, vomiting inmate on the floor, while they are sitting on their fat asses doing fucking nothing. Those people are despicable pieces of shit.
Sure, the nurse could have thought the same thing you did, "only GABA agonists produce fatal withdrawal symptoms, let her learn her lesson" and so forth. In my mind that only further proves what a worthless piece of shit this nurse is. Are you familiar with the Stanford Prison Experiment? Take completely normal people, put them in a jail as guards and inmates. They did this and planned to run it out for three months. But they had to end it after one week, due to brutality against the inmates. These people all knew this was an experiment, and these weren't real prisoners. This sort of treatment is some kind of human reality that we have to live with. It has come to be expected by courts and prisoners alike. The courts set standards of care because humans in a prison environment are unable to do it themselves.
YOU are trying to come up with some simple, clear ideological marker to rationalize what happened. No such thing exists in real life. People always have a duty to care, in this case a legal one.