content: Because criminals won't use self driving cars, or they'll swap the onboard computer with another car or buy one on the black market, or hack the firmware, or just tear out the antenna. If a self driving car can't function at all without a network connection it would be stupid, because that's a single point of failure. Self driving cars obey traffic rules, but police cars don't have to, so a self driving car won't be useful in a car chase with or without remote control.