Doctorow framed the question this way: “Computers are everywhere. They are now something we put our whole bodies into—airplanes, cars—and something we put into our bodies—pacemakers, cochlear implants. They HAVE to be trustworthy.”
Sometimes humans are not so trustworthy, and programs may override you: “I can’t let you do that, Dave.” (Reference to the self-protective insane computer Hal in Kubrick’s film “2001.” That time the human was more trustworthy than the computer.) Who decides who can override whom?