I think your point of "cost considerations" is at the heart of what bothers me about this paper. The laws about seatbelts, car seats, etc. came at the same tim

I think your point of "cost considerations" is at the heart of what bothers me about this paper. The laws about seatbelts, car seats, etc. came at the same time as a general sense of more parental responsibility as a whole. A few decades earlier the cost of additional children was much lower in every way.