Incentives don't work if nobody knows about it. You wouldn't be safe if your nuclear bomb-vest was concealed. You'd just be a walking timebomb. As to which estate gets to deal with the class action suit, since any and all possible witnesses have been vaporized, the only one we can conclusively prove to have been at the scene is you, with your vest. And since you're not around, either, to point the finger at the robber, well, guess who gets the blame for the smoking crater in the middle of the city?