Do you list these negatives when having that conversation? Do they not see the possibility of something like this being used against them or family members when you lay out the possibilities specifically (blackmail and industrial espionage could hit anybody)?

The "nothing to hide" trope seems to me to be entirely based on a false dichotomy that contrasts "nothing to hide" with "unpatriotic/criminal". I think this is primarily because people lack the imagination to consider the other seedier and more lucrative uses of surveillance.

If they were confronted with these other possibilities, would your acquaintances change their thinking? Or do these other risks--for example, the risk of having an employer targeted by competitors unfairly (potentially leading to layoffs), or the risk of having a representative vote against the interests of his or her district because of blackmail (potentially leading to a loss of government services and investment)--simply not resonate?

When I make this argument the most common response is that they have faith in the goodness of people and dont consider these risks to be very significant.