I think Bob and Carla’s problem isn’t really whether Bob is lying or not. If they knew for an absolute fact Bob wasn’t speaking things he knew to be factually untrue, Carla still has to sort through misunderstanding (maybe Bob’s talking about a LARP?) and drug use (maybe Bob forgot whether he took LSD the way I forget whether I’ve had coffee sometimes?) and psychotic breaks. I wouldn’t usually count any of those as “lying” in the relevant sense; Bob’s wrong, but he’s accurately reporting his experiences as best he can.
I don’t have a solution for the group membership case, which I think of as a special case of the reputation problem. I’m trying to point out a couple failure modes; one where you don’t realize a bunch of your information actually has a single source and should be counted once, and one where you don’t actually get or incorporate reputation information at all.
I agree adversarial action makes this much worse.
I think Bob and Carla’s problem isn’t really whether Bob is lying or not. If they knew for an absolute fact Bob wasn’t speaking things he knew to be factually untrue, Carla still has to sort through misunderstanding (maybe Bob’s talking about a LARP?) and drug use (maybe Bob forgot whether he took LSD the way I forget whether I’ve had coffee sometimes?) and psychotic breaks. I wouldn’t usually count any of those as “lying” in the relevant sense; Bob’s wrong, but he’s accurately reporting his experiences as best he can.
I don’t have a solution for the group membership case, which I think of as a special case of the reputation problem. I’m trying to point out a couple failure modes; one where you don’t realize a bunch of your information actually has a single source and should be counted once, and one where you don’t actually get or incorporate reputation information at all.