Buses need to be faster, even at the cost of reducing safety. Arguing that buses need to be designed to be more dangerous is disenguous. No one *wants* more dangerous buses. Better title: Buses need to be faster, even if more dangerous.

This issue was covered in quite a bit of depth in the 1997 book "The Case of the Killer Robot" by Richard G. Epstein. It was a great book and covers social, legal and ethical issues relating to responsibility of robotic “accidents" that result in human deaths.

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Or, a really good source of free children's books is the International Children's Digital Library (www.childrenslibrary.org). It has thousands of free (current and public domain) books from around the world, many of them available in multiple languages.