We have a powerful heuristic which is “believe what people tell you”. If someone says “quick, run! There's a lion coming!” Or “Don’t eat these berries: you’ll get sick” it’s best to believe them by default. Likewise, “Hey, I think you just dropped your wallet”.

Because this heuristic is so powerful it’s of course easy to subvert. But if we did a deep epistemological analysis of every symbolic input we’d probably be eaten before we had time to starve to death.