I hope people would make intelligent, informed decisions about driving after drinking.
Who can consistently make intelligent, informed decisions about anything after drinking?
Zero-tolerance with regards to drinking and driving ensures that people do not consider it as a first option, or even a viable option, even while they are drunk. If you tell people that it is a certainty that they will go to jail for driving drunk, they'll think twice. I agree with your "know your rights" attitude, but it seems a little irresponsible to be telling people step-by-step how to go from "dangerous drunk" to "legally drunk" while having a nice chat with a cop on the side of the road.
You do realize that if the cop pulled you over, there's usually a traffic-related reason? Like... perhaps you missed the stop sign back there, or you've had your left blinker on since you left the bar, or maybe you're playing chicken with the trees. If you've been pulled over because your driving is not up to snuff, you damn well should be riding in the backseat of a friend's or squad car.
Good for you for knowing your rights and your limit, and for being able to safely control a motor vehicle while impaired. Just remember that not everyone is as talented as you are.