I think I'd best say it as two parts, the first part is that the algorithms behind social media content are not known to us as end-users, which seems a bit unfair given that they control the entire world around us.

The second is that there is a system at work here that no individual person or company is in control of. If one news agency decides to not publish content that is outrageous, they may simply just be out-competed by all the others that decide to maximize for outrage, and no improvement will occur. Similarly, it's difficult for social media companies to simply 'change' their algorithms to do good things and promote good content, for this reason and many others.