This type of legislation happens when people cannot police themselves. It only takes a few drinks to impair one's driving ability yet too many people could care less in the pursuit of exercising their "rights". Maybe if folks would just wise up then we wouldn't need government to do it for us.
I speak as a recovering alcoholic (16 plus years sober) but also as a friend of someone murdered (and that's what it is when you have been warned not to drink and drive) by someone having some drinks after work.
Congratulations on your sobriety.
I know that this isn't a great scientific study, but on Mythbusters they had some of the hosts drive an obstacle course at .75 intoxication and while talking on the cellphone. Surprisingly, if you said talking on the cell phone was far more dangerous you would be right.
Not bragging, but I've been to bars in 7 countrys in the Marines and my intoxication level is super high. It is far more dangerous to have some of the elderly and/or cell phone talkers on the road who are prefectly legal than to have me at .8.
The only time I came close to wrecking a car in 30 years was when I was talking on a cellphone (never wrecked in a million miles). No longer use in a car.