From University of Michigan School of Law:

Arthur Rizer, from the conservative think tank R Street Institute, argued that the lives saved by adoption of driverless technology will far outweigh any risk of criminal or terror threat from a hacking. Rizer calls the risk “minute compared to the lives that we will save just from reducing traffic accidents.”

If a significant portion of the roughly 40,000 traffic fatalities per year can be prevented by the adoption of automated vehicles, Rizer is likely correct that the benefits will outweigh any risk that vehicles will be hacked by bad actors.