Political assassination via cyber attack/backdoor? ezpz, find a tree, accelerate into it, claim it was the car acting up.
Bug in the software? Sorry you're dying today because they wanted to repossess cars easier, your life is less important than protecting capital.
We're in a world where deregulation has planes either falling out of the sky or attempting to. I don't trust any soft handed regulation on cars without manual overrides.
My car has a push start, but also a manual transmission. I know if something goes wrong and my engine stops responding to the electric throttle I can just pop out of gear and coast.