One reason is society has largely restructured itself to make raising children much more difficult than it used to be. It used to be "it takes a village", now t

One reason is society has largely restructured itself to make raising children much more difficult than it used to be. It used to be "it takes a village", now that village is atomic families that don't talk to each other and traffic that makes playing outside deadly, and instead of living in multi-generational homes where grandparents can help with raising children, parents live on their own. So the burden is much higher, and parents cope with it in unhealthy ways.