I like books also. I never hear of the Lying Life of Adults but it sounds interesting.
Falsehoods protect us, mitigate suffering, allow us to avoid the terrifying moment of serious reflection, they dilute the horrors of our time, they even save us from ourselves.
That is very deep. But Possibly true. I prefer not to lie myself altough maybe a white lie here and there.
At moments when guilt and shame threaten our conscience, when they shake our deepest beliefs about who we are, petty lies stop us from looking too closely at ourselves.
Yes  I agree and somtimes a lie will protect you from what happens if you tell the truth. Telling the truth sometimes can cause a lot of damage.
Literary fiction is also a lie, according to Ferrante, but a lie that is made purposely to always tell the truth. 
You seem very well read. I have very little time to read but love to when I can.
Fiction is an illusion that tinkers with our sense of reality to lay bare the price we pay for our petty lies
yes I agree fiction is an illusion. Lying can also create an illusion.
Fiction shows us that narcissism and self-doubt impel us to hurt others; that we are quick to betray people who trust us