It's a silly concept IMO because it assumes that civilizations with the ability to do interstellar travel or communication make the decision to not do so because they have knowledge of an interstellar force that destroys any civilization that does so. It would seem like any civilization that becomes aware of such a force would be destroyed, so how would all of these surviving ones know of the danger? Actual dark forests are quiet because a mix of the animals' instinct and visible signs of danger.

While it's possible that some civilizations would hypothetically be able to observe what happened to others and keep quiet, they would all have to do so to solve the contradictions of Fermi's paradox.