If I have a kill switch on my platform for apps that endanger people and I see that the app is endangering people, I'll feel a moral obligation to toggle that kill switch. Again, this is a rather straightforward call.
Don't get me wrong. I'm not a fan of drunk drivers and I'm less a fan of people screwing with their phones while they drive, which seems a whole lot less safer. But it's arguably something Apple and/or the carriers could address. However, I don't think it's right for them to do so. I guess it's the whole slippery slope thing.
And FWIW, I do turn around if I think a roadblock is ahead, regardless of whether I've been drinking. It's a hassle and I don't trust I'll get a ticket for something else I'm completely unaware of.
The platform vendor should not have final say over the software an end user may wish to run. The restriction of software distribution to Apple's own app store on such a popular computing platform has serious ramifications to consumer interest if not exercised very carefully to be perfectly aligned with them.