If it's truly spam, flag the comment (and downvote it) and move on; there's little of that on HN. I assume you're talking about comments we perceive as low-quality. The obvious solution there is to downvote them, but I think you are talking about responding:
Passing judgment is very tenuous business and how I make most of my worst mistakes - then I'm the fool, who is spamming and worse, poisoning the conversation. Much better to be curious and ask. Usually I learn that what I understood as spam was my limitation - I didn't think of another interpretation, or that the author just needed to spell out a good idea a bit more, and now I've learned something. And sometimes the author didn't think of something and they learn something from me, which they wouldn't do if I attacked them.
It's also respectful, which is essential, and we have two people with positive interactions, which is also critical in this age.
As an example, I personally would say, if I had to judge, that your comments are spamming this discussion, and in multipile ways that explicitly violate HN guidelines. I am giving you the benefit of the doubt, that you are an intelligent person in good faith - which you deserve - and I think we're both rewarded.
Seriously, read the HN guidelines (link at bottom of page). They not only explain the ways of HN, they are a good guide to effective social media technique in general.
> Do you believe there is ever ...
My response is that hyperbolic, extreme hypotheticals lead to arguments and are not useful. Life does not happen at those extremes, nor does the interesting discussion.