This effect on a child aggregates up too. The result is a tribe/society issue of unguided kids who don't benefit from the stability, specialization, opportunity

This effect on a child aggregates up too. The result is a tribe/society issue of unguided kids who don't benefit from the stability, specialization, opportunity, and generational progress provided by a nuclear family. That said, however, if we use catholic countries as an example baseline for any implied evolutionary effect of forbidding divorce - they don't do too well against protestant nations, and particularly vs. anglicanism which was founded on divorce. British colonies vs. catholic Spanish and Portuguese colonies fair much better. Maybe marriage is a net positive, and the remarriage from divorce helps humans iterate faster.