A feel like your A & B are covered by the last and second points. A) they do not trust you. Hence, they want to avoid manipulation in bad faith. B) They expec

A feel like your A & B are covered by the last and second points. A) they do not trust you. Hence, they want to avoid manipulation in bad faith. B) They expect private details to be used against them. Hence, they want to avoid persecution. C, however, is an interesting point bearing further discussion. It's something that a developer can't address directly except to not have whatever private data is under consideration in the first place.