I think it’s because a lot of things are bad (and many are getting worse) yet the only power most people have to do anything about them is to raise awareness of the issues, which means engaging with negative news. Sometimes it can be hard to tell what’s real news and what’s rage bait; sometimes non-news can seem like news when it’s part of an ongoing pattern (such as “Elon’s dumb take of the day”). I think there’s also some degree of trying to maintain one’s sense of reality. To the previous example, despite being a massive fuckwit, Elon is still among the wealthiest people in the world, is incredibly influential, and has maintained some degree of fanboy army; posting/reading/discussing/upvoting an article about what dumb thing he said today is grounding for some folks because it reinforces reality by demonstrating that yes, he is still a fuckwit, even though somehow everything still hasn’t come crashing down around him like it karmically should.