The gist of it seems to be this:
>>> Requiring the use of CRS for children under two would
significantly increase the price of family air travel for a
small targeted population
• Price affects consumer decisions
• Would cause some families to divert to the highways, a
much higher risk mode of transportation.
• For every child under two saved by a regulation (1
every ten years), a minimum of 60 lives would be lost
on the highways.
I didn't read the whole thing. I'm not sure how they think they know this is what would happen.