It’s not really possible for Facebook to take itself out of the equation—Facebook sets up its algorithms to encourage the spread of engaging content. So if a story spreads on Facebook, it’s because they designed their algorithms to make engaging content spread. But if Facebook goes and adds a special-case on top, “don’t spread this particular story,” then they’re obviously interfering at that point. So they sort of inherently have to take a position one way or the other. The only other option is to do something like always make the algorithms focus on engagement without any special-casing, possibly with a general rule to limit how fast any new story spreads, but presumably they have reasons for not wanting to do that.