Even a small, everyday lie is a clue to the personality and preoccupations of the liar, like a dream or any other confection of the mind, that is half-conscious and half-unconscious, as all creative acts must be.
fiction and lies are both works of creative art, and creation always reveals the creator.
Wouldn't it be kinder to say that a lie is a short work of fiction? 'A story' as my daughter says?