I think you're conflating the notion of perfect curation. I don't think anyone is claiming that journals or journalists are infallible. They certainly make m, although I don't think I agree that the good is "dwarfed" by them, except when used as a direct attempt to undermine credibility by adversaries.

Put differently, do you think bad ideas spread more easily with the internet? The current research seems to think so, and if you agree, I don't see how that mitigates the spread of bad information. If anything, it exacerbates it.