I understand well what is said here. With that said, if you are at work, you do your work. Also, you should not be using corporate bandwith to catch up on your own reading agenda. Do that at home.
My annual performance review includes a category for "staying on top of recent developments in web development and software engineering." In light of that, I would not call Hacker News my personal reading agenda.
Yes, they should. That said, lunch / coffee break HN is something I look forward to. I get to keep up on with (some parts) of the startup world and generally learn something new every day. Of course my optometrist would freak if he knew I was using my break time to read HN ...
You might even want to pick up a copy of "The Hacker Ethic" by Pekka Himanen.