Why people on Hacker News comment without reading

I am quite sure a big % of people on Hacker News comments on articles they haven't even opened, let alone read. Maybe I am completely wrong though.

If you are reading this, don't comment, maybe upvote. Let's see what people say in the thread.

I'll organize comments from the thread in here later if a discussion actually develops like I did here some time ago.

BTW this "article" is based on an NPR stunt I read about in the book "Trust me. I'm lying".

They wrote an article: "Why doesn't America read anymore?" that led to this:

"""
We sometimes get the sense that some people are commenting on NPR stories that they haven’t actually read.
If you are reading this, please like this post and do not comment on it.
Then let’s see what people have to say about this “story."
"""