Because the proportion of time where we might have done something we wish to hide is low, while the proportion of time you might counterfactually have done something to hide is high. So by asking you every day, a questioner can figure out that 99% of the time, you didn’t actually do anything to hide.
Because the proportion of time where we might have done something we wish to hide is low, while the proportion of time you might counterfactually have done something to hide is high. So by asking you every day, a questioner can figure out that 99% of the time, you didn’t actually do anything to hide.