Cognitive weakness, at least in the West, go in parallel with other social phenomena: diminishing fertility, finacial deterioration (then one job fed 6, now two

Cognitive weakness, at least in the West, go in parallel with other social phenomena: diminishing fertility, finacial deterioration (then one job fed 6, now two are not enough for 3), smart devices that make people dumb, trendy wars, stress/depression pandemia etc Some are causes and the rest results but nobody knows which ones: the egg made the chicken or the chicken the egg?