One consequence that seems to flow from this, and which I personally find morally counter-intuitive, and don’t actually believe, but cannot logically dismiss, is that if you’re going to lie you have a moral obligation to not get found out. This way, the damage of your lie is at least limited to its direct effects.
With widespread information sharing, the ‘can’t foll all the people all the time’-logic extends to this attempt to lie without consequences: We’ll learn people ‘hide well but lie still so much’, so we’ll be even more suspicious in any situation, undoing the alleged externality-reducing effect of the ‘not get found out’ idea (in any realistic world with imperfect hiding, anyway).
With widespread information sharing, the ‘can’t foll all the people all the time’-logic extends to this attempt to lie without consequences: We’ll learn people ‘hide well but lie still so much’, so we’ll be even more suspicious in any situation, undoing the alleged externality-reducing effect of the ‘not get found out’ idea (in any realistic world with imperfect hiding, anyway).