I drink and drive all the time. As an adult I am an experienced drinker and know when ive had too much to drink and when i haven't, it's called maturity. So just because i have 0.09 or 0.10 in my system it doesnt mean im drunk, it just means im over what the law says i am. If I were ever in a situation where i had to choose between a mature drinker who's over 0.08 and has driving experience vs. someone sober who just got their license id take the mature "drunk" driver.
If the government wants to effectively control drinking and driving then they should just ban drinking and driving all together and develop special licensing for those that want to drink and test them based on their tolerance levels, rather than generalize and say anyone over 0.08 is drunk, that's just bs.