Then we should at least learn their capabilities by throwing jumping dummies at them. Call it the new dummy testing. It's the least we can do. Did Travis bro do this when he set the plan in motion?
Maybe not in the U.S., but in Norway, as part of getting the driver's license, you'll have to take an ice driving course, where, amongst other things, a dummy is swung at your car while driving on an oiled lane in 30 mph. (It is practically impossible to steer away from the dummy, which is the meaning of the exercise; to realize the folly of driving too fast on icy roads)
Because it's assumed human drivers will at least have a desire to stop. If a machine isn't properly programmed, it will plow right through a crowd and never look back.