Earlier quoted context omitted.
Self driving cars are not magic and judging their braking distance is not much easier than with a human driver. I think kids trying that will quickly find out that it's not too hard to make an autocar hit a human. In other words, I think the problem would quickly solve itself.
In bad neighborhoods, the carjackers(might not want a autonomous car though) or robbers might just roll a beach ball into the street to stop the car or maybe just a cheap open umbrella. I can imagine those people who practice "rolling coal" doing the same thing to rich autonomous car riders or just throwing a beach ball out the window on an interstate. Lots of possibilities that security researchers will need to cons…
If carjacking becomes a problem the cars will figure it out and start locking all the doors. Or if the car is unoccupied, let the carjaker in, then notify the nearest police station it is coming in with a criminal.