> How could the eradicators detect and destroy their victims before we detected any signal at all from the victims? And why haven't the eradicators come for us

> How could the eradicators detect and destroy their victims before we detected any signal at all from the victims? And why haven't the eradicators come for us yet? Because most civilizations are probably still a 100+ light years apart and we just haven't been around and listening for that long? Even if we've theoretically had the chance to detect another early civilization the other listeners have been listening for aeons longer than us and are much better at it.