Lots of people do work really hard on mitigating this problem. It's a tough and constant battle, but that doesn't mean you have to throw your hands up and not bother working on it. I'm sure you're right that my bank isn't working to mitigate insider threat to the extent I'd like, but Tesla's code is more safety critical than my bank and I think it would be worth their while to work very hard on keeping this from happening with their computer-on-wheels.