I don't know if ChatGPT has saved lives (thought I've read stories that claim that, yes, this happened). But assuming it has, are you OK saying that OpenAI has saved dozens/hundreds of lives? Given how scaling works, would you be OK saying that OpenAI has saved more lives than most doctors/hospitals, which is what I assume will happen in a few years?
Maybe your answer is yes to all the above! I bring this up because lots of people only want to attribute the downsides to ChatGPT but not the upsides.
Now, if someone acts in a risky situation and kills someone rather than saving them, they can be OK. But in those situations, it has to be a sudden problem that comes up or the actor has to get "informed consent".
Someone who, unleashed a gas into the atmosphere that cured many people of disease but also killed a smaller number of people, would certainly be prosecuted (and, sure, there's a certain of HN poster who doesn't understand this).