Would it not be more logical to say that adults have probably buried these memories. Not forgotten, just left them in the past and moved on. You want to claim that all mothers love their kids, but we read of children murdered by their parents everyday, so if murder is indeed a fact, then abuse must also.
Not all scars are visible, not all hurts spoken of, and not all pain disappears.
Every teenager tells a story that their moms hate them, no one over 30 has ever mentioned that their moms are like that. Plenty of teenagers misunderstand their parents motives, they don't understand their parents reasons with their limited knowledge of life and of how children think why the parents act that way. It is naive to think otherwise.