Although a context would be helpful, but a general trend I have noticed on SE sites and not this in particular is the fact that a perfectly valid question/answer gets downvoted due to nature of comments which goes south. No doubt etiquette and politesse is important but shouldn't we judge q&a on merit of it's content instead of the baggage of etiquette that comes with it?
Also, it seems questions that are in the line of -I apologize if this is too basic for this site -I am sorry for this dumb question
or any self-deprecatory ones that goes defensive quickly for appeasement of others seems to be looked favorably. Again from psychological point of view, this sort of kowtowing is held laudably because voters don't get offended.
Tangentially, all the sensationalist questions dealing with major unsolved problems that claims to have a solution also gets downvoted pretty quickly. Again from psychological point of view it seems that voters get offended implicitly with the assumption: If you are a genius why not submit to journal? This only prevents from creative output and yes, a downvote for violating the FAQ rules that SE is generally not for review is perfectly valid, but it seems to be an issue of ego.
Coming back to original point, if comments have some negative quality they should be flagged or removed instead of impacting the user's main point.
(Btw, it seems to me a bit ironic that sometimes the sheer number of negative votes actually cause me to click the questions instead of avoiding them. Yes, I know purpose of downvotes is quality control.)