You think that just shutting down the communication medium really makes all of that go away"?
I don't think shutting them down will stop it but I think a lot of todays hyper-partisan inflammation of the citizenry is owed to these platforms and their encouragement of any and all "engagement" on their platforms in service of ad dollars. These companies know how harmful these products are but since they're profitable they ignore the findings. I would argue that Meta/Facebook is the Philip Morris of our generation.
Also, you've mostly been posting unsubstantive and/or flamebait comments and that's not allowed either.
If you don't want to be banned, you're welcome to email hn@ycombinator.com and give us reason to believe that you'll follow the rules in the future. They're here: https://news.ycombinator.com/newsguidelines.html.