There must be people with great ideals, someone who will choose the high road as often as possible. Just as there must be people who know that the system cannot change from within, that it must be torn apart and began anew.
I like the concept, minus the real life examples of Magneto-minded dictators and violent revolutionaries. I think having that balance gives the average person, the reader, the opportunity to see the places where an idealist fails and where an extremist goes too far and how to walk a path closer to the middle.
I think his math is bad because he just went with a cool round number.
But, more realistically, she was probably going somewhere between 55-70 mph (don't know road or highway or whatever) and that's still a difference of 70-90 miles an hour. So I'd say yeah, the seat check MIGHT prevent harm if you're super duper lucky but I don't think that baby's walking away from that with anything less than life threatening injuries