I can see the upside to this idea. Take the decision of whether to drive drunk away from your average new Camry driver and give it to a machine—no more drunk drivers.

I know drunk driving affects innocent people and we should do whatever we can to prevent it, but I still think people should have the ability to make shitty decisions.

This kind of thing takes us one step closer to a world where every choice we'd otherwise make is now controlled by someone else. What happens when it's time to vote? Do the nanny-trons step in an prevent us all from electing the "wrong" person? What about personal lives? Will one night stands go the way of the dodo once the chips in our heads make it impossible to make a potentially self-destructive choice?

Eliminate risk and you eliminate any payoffs that risk could hold.

I'm not advocating drunk driving. I'd be hard-pressed finding a good reason for ever doing it (evading an attacker, maybe?), but the general trend towards a tradeoff of freedom for safety frankly scares the shit out of me.