[kinkrtyavimoodh]

OP literally started their comment with "No." and followed it up with 3–4 blanket assertions.

Slatestarcodex has a comment policy (http://slatestarcodex.com/comments/) that I think is very relevant here too because I think that's how people implicitly judge most comments—"If you make a comment here, it had better be either true and necessary, true and kind, or kind and necessary."

OP's statement was not 100% true so it should at least have been necessary / relevant AND kind / humbly put. It wasn't kind.

[tpeo]

I didn't say he was kind.

I am good to people who are good.

I am also good to people who are not good.

Because Virtue is goodness.

People should be thought as being free to speak their mind in whatever way it suits them. Not because they should, but because they will. And when the time comes, it's up to me whether to make an issue of it or not. And in so far as I know, I'd rather not.

[AsyncAwait]

It has nothing to do with being kind. It has a lot do do with contributing to the discussion with something useful. Just asserting things without any evidence is not useful and thus downvoted to make more room for more useful comments nearer where people would see them, that's all.

[tpeo]

I disagree that a comment has to be sourced to be a contribution to the discussion. Whether or not something can be a contribution depends entirely on what people expect from comments. If all I expect is to have a little bit of thought, it doesn't really need to pack on citations, and even a question might suffice.

Which might sound dilletante-ish, but isn't really out of place for anyone reading a pop-sci article on animal cognition during a Saturday evening, on their spare time.

As for downvoting or upvoting, I've never seen any actual evidence that either does anything useful.

[AsyncAwait]

There's a difference between a comment stating an opinion having no citations, (I think that...) and one supposedly stating facts, (You cannot have...). At least if we want HN to maintain a higher quality of discussion than 4chan.