I don't think that's a good analogy. Our planet is on set course orbiting its sun. We know that sooner or later we'll get hit by something big. We have no control over that. The idiot who tries to dart across a busy street and gets hit did have a choice. We don't. We have ideas on what MIGHT work. But no idea has been tested. And it really wouldn't matter if we don't spot the object in time. And if it's a cluster of smaller objects whose total mass is enough to cause an extinction level event, we have no defense. And how are these societies being exploited? They are being watched, no interference was done except in the case of the Boral and the Ba'ku.