That "soundness graph" is the gold standard of reasoning that we're consistently not achieving. Probably because it's too computationally expensive in general for our brains. So instead we use shortcuts.
As a shortcut, trust graph is actually pretty good. Consider this example monologue:
This guy says really interesting things about cars, but my good friend Sally the Car Mechanic says he's talking nonsense; she's an expert in the domain, so I'll approach the new guy with huge dose of scepticism.
Note how trust graph implicitly takes care of known unknowns and unknown unknowns - I know little about cars, Sally knows a lot, so she's able to evaluate the situation better than me. Note also how it handles intent - Sally is my good friend, I trust her to have my best interest in mind, so I know what she's saying is her real opinion, and not e.g. trying to keep me as a customer of her workshop.
Intent is hard to judge, but is unfortunately very important when dealing with information that's not directly and independently testable (which is most of them, including especially conclusions drawn from testable facts). Trust graphs, or Evidence-based Ad Hominems™, are a very powerful shortcut for evaluating information.
As a shortcut, trust graph is actually pretty good. Consider this example monologue:
This guy says really interesting things about cars, but my good friend Sally the Car Mechanic says he's talking nonsense; she's an expert in the domain, so I'll approach the new guy with huge dose of scepticism.
Note how trust graph implicitly takes care of known unknowns and unknown unknowns - I know little about cars, Sally knows a lot, so she's able to evaluate the situation better than me. Note also how it handles intent - Sally is my good friend, I trust her to have my best interest in mind, so I know what she's saying is her real opinion, and not e.g. trying to keep me as a customer of her workshop.
Intent is hard to judge, but is unfortunately very important when dealing with information that's not directly and independently testable (which is most of them, including especially conclusions drawn from testable facts). Trust graphs, or Evidence-based Ad Hominems™, are a very powerful shortcut for evaluating information.