I'd toss out an evolutionary argument that for the last million years memory is mostly useful for who owes what to who so we can play well known small tribe pol

I'd toss out an evolutionary argument that for the last million years memory is mostly useful for who owes what to who so we can play well known small tribe politics games... Given that as a (possibly obvious?) starting point, a subgroup that remembered every time some a 2-year old kid stole their pet dinosaur from another 2-year old kid, would mostly result in senseless adult strife. So we're better off not remembering our childhood as we get older. Subgroups that forget childhood animosity will outperform subgroups with perfect, but useless, memories. I'd even toss out the hypothesis that all relationships change at puberty so toss out all memories at puberty because its a whole nother ball game. However the same system that stores "how to hunt dinosaur" also stores "Little billy stole my toy dinosaur when I was 2-years old" so the erasure system optimizes at a certain relatively high level of forgetting stuff. And yes I know my years are all made up and the non-overlapping relative timespans of dinos and humans so I wrote in a very general flippant sunday afternoon sense.