We have these accidents and pileups constantly without involvement of assisted driving technology. By your logic we should disallow anything that could ever hurt anybody.
The past century of car-based thinking has damaged the US's planning brains. We need to go back to first principles and think about serving the needs and wants of humans, rather than serving the needs of a hugely space inefficient and health-damaging transit mode.
You can't pick just one and say it's the best for everything.