Discourse and logical thinking are the basis of modern society and all of it's afforded comforts. If the inventors of the past had coddled themselves in a hugbox for their entire lives we would still be saying things along the lines of "A train can never go more than 10 miles an hour", "there wont be a market for more than 10 computers in the world", and "you wont ever need more than 64k of ram" because there would have been no one who would have heard--or even said for that matter--"No!"
If someone disagrees with you, just explain your points rationally and calmly. If it something you are passionate about, like the OP has pointed out in https://xkcd.com/386/, then isn't it worth the 15 minutes it will take to explain your viewpoint as I am doing here?
No-one is stopping HN users from commenting, they're just allowing themselves the opportunity to easily ignore it. I don't see anything wrong with that. Why is someone obliged to spend 15 minutes of their time indulging you?