They do actually, the humans driving the car can respond to a threat that an autonomous car would have to be programmed to avoid
On the contrary, over the years I've read on many occasions how drivers and passengers have been seriously injured or killed by the morons who get a kick out of dropping objects from an overpass.
https://www.tennessean.com/story/news/local/wilson/mt-juliet...
One bricked GPS system can attack an entire country. Or planet.