Why single out "more protective" as if it were a relevant factor? Surely that's a personal value, without a strong rational justification. It's also decreased

Why single out "more protective" as if it were a relevant factor? Surely that's a personal value, without a strong rational justification. It's also decreased as the amount of environmental lead has decreased. It's also decreased as the number of computer screens has increased. It's also decreased as sugar consumption has increased. (Are parents actually being protective as they feed more sugar to their kids?) As has our consumption of GMOs. It's also decreased as government-mandated product, automobile, and housing safety standards have increased (which is different from parents becoming more protective!). A rational response would be to hold off on highlighting any specific correlation until establishing that it's more meaningful than other alternatives.