Find a comment that was well articulated and didn’t match what you consider the hive-mind; find as many as you can, really: show how those got more downvotes than similar comments matching the majority opinion, and less visibility as a consequence.
Here's one of them. I could spit through dozens of comments and put a whole list of comments here to satisfy your request further - but would it make a difference? It's well known (and probably verified research can confirm) that vote-systems adhere to common denominator circle-jerking.
There are good places to have that debate, and HN just isn't one of them.
By "not substantive" I do not mean false, but rather that the signal-to-noise ratio of a comment containing many grand, unsupported claims is low.
Since you don't want to provide us with dozens of examples, how about picking, say, three that have the highest signal-noise ratio of the lot, and weren't uncivil? I'd like to see those. I know such comments exist, because I see them, yet the people charging HN with groupthink never seem to cite any clear examples.