Propagating a run simply takes propagating the info that a run is happening. No other communication is necessary. That signal is enough.

Coordinating stopping a run would take a huge amount of much more sophisticated and time consuming back and forth communication and negotiation, reassurance and confidence building. You’d have to convince people that together right now in this situation you can stop the run. How would you do that? That coordinated consensus building would have to happen and propagate through the community, all of the community, at least as fast as the news of a run in order to stop the run. If it’s slower it’s too late, the people that heard there’s a run before they heard there was a movement to stop it already pulled out their money.

You see the problem?