You have some fair points but your comment crosses into personal attack, and that does more harm than the fair points do good. Could you please (re-)read https://news.ycombinator.com/newsguidelines.html and not post like that here?
I agree with you about the unhelpful replies and am attempting to respond to them all. If you notice one I missed, it would be helpful to send a link to hn@ycombinator.com.
People don't do this kind of this kind of thing intentionally, but because their interpretation of others' comments are distorted by cognitive biases that unfortunately nearly everyone is aware of. It leads to inappropriate responses, and occasionally cruel and even dangerous ones.
When someone posts from a place of suicidal suffering and another user replies with "that's sick", asking if it's a joke, and using sarcasm ("heaven forbid") etc., that's brusque enough to count as personal attack in this intensely personal context. Had the original comment been about something trivial, I wouldn't have called it that, though I might have still called it uncivil.
So the answer to your objection is that I appreciate your standing up for the site guidelines but we have to adjust moderation for context and this was a special context.