Well.. did he "kill" 300 people and profit from those deaths...
Yes. Plain and simple.
or did he facilitate the deaths of 300 people who were being kept alive beyond their willingness to endure.
No. Don't go there. No excuses for this guy.
Few if any of his patients were terminally ill. He injected drugs to start a heart attack, then attempted to reanimate them, some with success. He relished the reputation of being the #1 re-animator. Sometimes he was just bored. He also managed to kill people who were in otherwise good condition. So, clearly a psychopath. Yes, a monster.
That being said, he couldn't have racked up such a large bodycount had it not been for the extremely reckless behavior of the first clinic (Oldenburg, I think) which suspected that something was fishy with his behavior and the many deaths that "happened" during his work shifts; a clear statistical anomaly. But because they couldn't 'prove' it, they let him transfer to a second clinic without notifying them about the suspicion, they also didn't call the police to investigate to preserve the reputation of their house.
Is it bad to help people who are suffering today to not suffer tomorrow if that is their will?
Who documents that it, indeed, is "their will", who gets to decide that their wish to die is genuine?
This is a very slippery slope with ethically a broad grey zone (mostly medium to dark grey), and enormous abuse potential. There is very good reason why legislators are extremely hesitant here.
The article and trial are written as a foregone conclusion that he is a monster and 'profited' from his abuses even if only in 'Narcissism', but I don't see it as a 100% black and white proposition.
Maybe because it is that you haven't heard about his case until recently. The case is years old, several trials have been performed (no mistrials, no misconduct by investigators, state attorney, or judges, as far as I can tell). In short, there is nothing that could remotely justify or exonerate these killings.
I've had pets who were suffering Euthanized when they could not recover and had little prospect of anything beyond a lingering and painful death (usually cancer)... but we find the same unpalatable for people, even when they request it themselves.
Not sure if a debate of this point wouldn't very quickly get this thread moved to PWEC, but I'd like to say at least once and for the record that I can see substantial differences between pets, and people.