The outrage seems to be like a drug. Nothing generates engagement quite like it, even if it's toxic in the long-term. So all social media platforms that embrace it grow bigger until they become near-monopolies, and all that don't so far have had a hard time growing userbases, making money, and generally fade into irrelevance.
It would be a real service to society IMO if we could find a way to somehow generate enough engagement and energy to challenge the big players without the outrage culture.