i lost my license (2.5 years total) for drinking and driving 11 years ago. total cost of "that great night out" is over $50,000 by the time i paid lawyers fees, fines, remedial programs, taxis, insurance, license reinstated etc. it was the most costly mistake of my life. only lucky thing was no one got hurt. just my pride!!! now i don't even go out drinking. if I'm gonna have a beer, it's at home.
now, lowering the limits likely wouldn't have made a difference in my case. i was plain stupid. but toughening the laws now means that if i get caught again, i can be sent to jail for some time. not worth it at all.
BAC is hard for the public to understand because it affects each person differently and from day to day. the average man can safely drink (4-5%) 1 beer/hour. (yes there are a ton of things that can effect that) and by lowering it down makes it almost impossible to have 1 beer/hr. that's there idea of saying "we aren't saying you can't have a drink and drive, but if you do, you are guilty and there's a hefty fine"
I can go on and on about this topic since I've been there and done that.
don't drink and drive, it's just not worth it.