I mean, that's 99% of internet comments. There are many topics I disagree with the HN majority (or vocal minority) on, and it becomes tiresome to see the same old stuff rehashed in every article when it's mostly off topic. But if we didn't allow people to comment unless they were genuinely open to having their mind changed about something, there would be no comments.
If you debate someone on the internet, you will never change their mind. But you might influence the opinion of someone else who reads your comments, and that's the best you can hope for.
Also, when a large number of people are wrong about something, there is often an opportunity of some kind associated with that. An investing opportunity, a career opportunity, a startup opportunity. When you see what others don't it can be a big advantage. So, embrace it.
