You aren't responding to your parent's actual point, you've reworded it slightly and proceeded to disagree with the strawman version you created.
Their point was that news and politics were introduced to forums which were not about those things, and proceeded to turn those forums into shitfests, which is completely accurate.
For some reason you avoided the word politics in your reply and carefully recast the subject as "news and information and learning and debate." But politics is really what the argument hinges on. People didn't sign up for Facebook to fight over divisive political issues, but Facebook promoted those conversations for the sake of short-term profit.
It's completely 100% fine for us to say fuck that, get your politics out of here and it should have happened a long time ago. One reason HN is good is because it holds its nose when it comes to politics - sometimes it gets through, yes, but the worst stuff is usually downranked one way or another (flagging, algorithmic sorting, manual modding, etc. etc.).
There are plenty of places on the Internet for debating politics. We don't need to search out forums that aren't about politics, and then convert them into political debates.