As to why people like Joseph Lelyveld are writing memoirs, I think they're just catching on the coattails of the trend.
Francine du Plessix GrayOnly friends will tell you the truths you need to hear to make your life bearable.
Francine du Plessix GrayFriendship is by its very nature freer of deceit than any other relationship we can know because it is the bond least affected by striving for power, physical pleasure, or material profit, most liberated from any oath of duty or of constancy. With Eros the body stands naked, in friendship our spirit is denuded.
Francine du Plessix Gray