And what, leave the Rust community not knowing that there's no CoC team because they've all resigned over something, but the community wasn't informed?
It's not like there's some membership card with paid dues. Their responsibility was to anyone that viewed themselves as part of the Rust community, and consumes anything to do with that community (whether or not they put anything into it).
Not informing all the people of that community because it appeases random public commenters would be a far worse failure of their duties than letting the general public gossip.
Employees have no duty to find replacements for their employer. There's especially no moral duty if your bosses are being jerks. I'd say that logic applies to this situation as well.
It's not like there's some membership card with paid dues. Their responsibility was to anyone that viewed themselves as part of the Rust community, and consumes anything to do with that community (whether or not they put anything into it).
Not informing all the people of that community because it appeases random public commenters would be a far worse failure of their duties than letting the general public gossip.