I think you're misreading a singular opinion as occurring between two disparate points here.
The initial phrase was
> doctors hurt people for years while learning to save them
It's then a separate reply from someone else about deaths from errors/malpractice.
So, nobody seems to be expressing the mentality you are, correctly, lambasting (at least so far as I've read in the comments). But, as it is relevant to the lessons we'd all want to pass back to ourselves (in my opinion, it's because we wish to hold ourselves accountable to said lessons for the future), let's address the elephant in the comment.
Normalising deaths, especially the preventable ones, is absolutely not something that anybody here is suggesting (so far as my read of the situation is).
Normalising responsibility, by recognising that we can cause harm and so do something about it, that seems far more in-line with the above comments.
As you say it yourself, there's a time and a place, which is undoubtedly what we hope to foster for those who are younger or at the start of learning any discipline, beyond programming, medicine, or engineering.
Nobody is saying that the death and loss is acceptable and normalised, but rather that in the real world we need a certain presence around the knowledge that they will occur, to a certain degree, regardless. So, we accept responsibility for what we can prevent, and strive to push the frontier of our capacity further with this in mind. For some, that comes from experience, unfortunately. For others, they can start to grapple with the notion in lieu of it through considering the consequences, and the scale of consequence; as the above comments would be evidence of, at least by implication.
These are not the only ways to develop a mindset of responsibility, fortunately, but that is what they can be, even if you find the literal wording to suggest otherwise. I cannot, of course, attest to the "true" feelings of others, but neither can anyone else... But in the spirit of the matter, consider: Your sense of responsibility, in turn, seems receptive to finding the areas by which such thinking can become justification for the very thing it would otherwise prevent, either as a shield purpose-built for the role or co-opted out of convenience. That too becomes integral, as we will always need to avoid complacency, and so must also promote this vigilance to become a healthy part of the whole for a responsible mindset -- lest we become that which we seek to prevent, and all that.
Exactly as you say, there's a greater problem, but this thinking is not necessarily justification for it, and can indeed become another tool to counter it. More responsibility, more mindfulness about our intents, actions, and consequences? That will prove indispensable for us to actually solve the greater problem, so we must appreciate that different paths will be needed to achieve it, after all, there are many different justifications for that problem which will all need to be robustly refuted and shown for what they are. Doing so won't solve the problem, but is rather one of many steps we will need to take.
Regardless, this mindfulness and vigilance about ourselves, as much as about each other, will be self-promoting through the mutual reinforcement of these qualities. If someone must attempt to visualise the staggering scale of consequence as part of developing this, then so be it. In turn, they will eventually grapple with this vigilance as well, as the responsibility behoves them to, else they may end up taking actions and having consequences that are equivalent to the exact mentality you fear, even if they do/did not actually "intend" to do so. The learning never ends, and the mistakes never will, so we must have awareness of the totality of this truth; even if only as best we can manage within our limited abilities.