Earlier quoted context omitted.
Why on earth should society allow (i.e. license) a randomly-modified software agent to operate a motor vehicle? The idea that any "hacker" has the right to arbitrarily change vehicular self-control software and deploy that on a public roadway is laughable.
Like the steering wheel that's deployed on all public roadways right now? I'm struggling to see the substantial difference between "self driving car with modified software should be disallowed because safety" and "manually driven car should be disallowed because safety". The former is still strictly safer.
I find this to be an absolutely ridiculous statement. Software as we know it today is incredibly brittle. What will eventually be put on the road as fully autonomous vehicular control software will have been HEAVILY QA'ed, and will be continuously QAed by telemetry. Random people modifying that software invalidate any proof-of-safety from the upstream QA and monitoring processes.