I find this fascinating, because Tesla is meant to be able to completely autonomously drive a vehicle, so it knows how to drive safely, so what you would expect

I find this fascinating, because Tesla is meant to be able to completely autonomously drive a vehicle, so it knows how to drive safely, so what you would expect is just running the self-driving programme and getting it to judge how safe the real driver's actions are - ie, Tesla saw hazard X at time T, driver responded at time T+delta etc. That's what I would expect. Yet instead of this they've got something that could've been hacked together in 15 minutes by an intern.