I think there is a lot of outrage.
There has been an enormous crackdown on it since the early 1980s. The number of alcohol-related vehicle deaths per mile dropped 63 percent from 1982 through 2002.
But your point does make me think.
Part of it, perhaps, is that our country already tried Prohibition, and it didn't work.
Part of it is that, "everybody drinks." And a lot more people have driven drunk than have shot to kill.
Part of it is that while gun fatalities are largely seen as purposeful acts of senseless violence, vehicle deaths are largely seen as reckless acts. I know that the result is the same, but intent does matter. At least psychologically.
Part of it is simply our own irrational fears. We're scared to death of flying, even though we're more likely to die in a car crash. We're scared to death of Swine Flu while we continue to gobble down processed garbage and sit on our fat asses, waiting to die. We're scared to death of guns, when we are much more likely to be wiped out by a drunk driver.
EDIT: In 2004, there were 10,000 or so homicide deaths by firearms. In 2009, there were about 11,000 alcohol-related traffic fatalities. A lot of those traffic fatalities were probably the driver him or herself. I would still posit that the risk of being killed by a drunk driver, randomly, is much, much higher than being randomly killed by a gun. Most gun violence, I imagine, is targeted violence and related to drugs, etc., etc.