Only because there doesn't seem any way to fuck this up right now, doesn't mean there, in fact, isn't. The ongoing pattern is that "at the time it seemed like the right thing to publish", when in fact it's just about spinning the spin. You can't prove how certain the publishers were about their spin at the time of publishing, not even with your suggested solution, that I guess, would only get more journalists fired, and last time I checked there's already plenty of that.

Like how Snopes' fact checker seemed like a good idea, before they started getting things wrong too now and then. I mean, of course, it's not likely there's a holy grail solution and we're stuck in having to evaluate every day anew, which sources we trust and which we don't.

Regarding the part where spinning the spin is at least followed up by corrections and apologies - which few people read, anyway, after the damage is done, but there's NewsGuard, which does fairly technical editorial rating, which i find a very good idea.