Earlier quoted context omitted.
Because they're people who are also just trying to do a job. I'm sure there are some sadists out there who take pleasure in this kind of meeting, but I'm just as sure that for every one of those, there are a hundred (or a thousand) people for whom this is the worst part of their job, who go home and hug their kids with watery eyes at the end of a day that was horrible for them. You aren't mad at them, you're mad at t…
It's all about the ethics of it. If my employer tells me to call a person and tell them they are fired because they did a bad job, but it's clear that this is not the reason, I would say: sorry, but I'm not going to do that. Remember, it's an "employer", not a "boss".
(But for what it's worth, this doesn't seem to me like a cut and dry description of what happened here; sales is a very cut-throat quota sensitive profession in my experience.)
But nevertheless, I empathize with people who also have to figure out how to put food on their own family's table, in a profession (HR) that is itself very sensitive to downturns.
The comments in this thread read to me like software developers who have not faced a world where it is not easy get a better new job easily after quitting one that sucks, and / or who are young and unattached with very few expenses, and struggle to put themselves in the shoes of someone for whom a principled resignation could have devastating consequences.
It just seems to me like a classic case of shooting the messenger.