I remember a writing prompt that talked about how we’re broadcasting all our TV and radio for years then we get a reply that says, “Be quiet, they will hear you.”
Oh okay, so this insular civ broke radio silence to transmit something that will definitely be a big deal and recorded in our news and science papers in extreme detail, and they’re not worried that when the threat arrives they will trace that signal back to them?
I’ve never heard a good explanation for how the dark forest develops and stays stable for any length of time.