They kill thousands of kids despite the fact the we stole the streetscape from those kids and with it their independence. How many kids walk or bike to school compared to 1940? If we put sharks in all the pools it would reduce drownings too ..
Don't bother arguing with them, they obviously are not rational enough to see what is in front of their face. Most people are like this, although they will die saying otherwise.
The purpose was to show the effects that car over-reliance has on public safety and quality of life.
In the second scenario, everyone thinks the roads are too dangerous for kids (becuase they are, as evidenced by half of them getting killed) so they all drive their kids to school in oversized heavy vehicles making the roads even more dangerous.