No matter how self-aware you are, memoir wrenches at your insides precisely because it makes you battle with your very self—your neat analyses and tidy excuses. One not-really-a-joke saying in my family is, “The trouble started when you hit me back.” Your small pieties and impenetrable, mostly unconscious poses invariably trip you up.
In terms of cathartic affect, memoir is like therapy, the difference being that in therapy, you pay them. The therapist is the mommy, and you’re the baby. In memoir, you’re the mommy, and the reader’s the baby. And—hopefully—they pay you. (“No man but a blockhead ever wrote for any cause but money,” Samuel Johnson said.)