It's all in the black box. After an autonomous vehicle crash, all of the decision making state will be available so no autonomous car makes the same mistake ever again. Unlike teenagers, which can merely be encouraged to drive appropriately.
Even better - not only will the code/telemetry equipment that made that mistake be replaced, ideally the design/implementation procedures that resulted in that mistake in the first place will be reviewed. Given how frequently it will be used, I'd hope to see the same level of methodology we see with Space Control Software. See: http://www.fastcompany.com/magazine/06/writestuff.html for a nice article on this sort of software. I like the following comment: "Bill Pate, who's worked on the space flight software over the last 22 years, says the group understands the stakes: "If the software isn't perfect, some of the people we go to meetings with might die."
