First of all, HN already has a ban list of websites! EDIT [I am not sure, but I think I read about this before]

Secondly, you should note that this is for posting news and articles, and such type of stuff does not change often! I am talking about banning the link - the url, not the whole domain!

And even if we suppose what you say is correct, then they should ban it at least for a while... like 3 months ban or something!