The former doesn't follow from the latter. I mean, by leaving your house, you might slip and fall and die; that does not mean leaving your house is incredibly dangerous, because we have to account for both the severity of the outcome and the probability of it.
Pedestrian deaths are on the rise. https://www.nytimes.com/2019/03/07/us/pedestrian-deaths.html
People who are drunk should not be thinking “Oh I am only driving 40 miles/hour on an arterial road. I am not doing anything dangerous.” Driving a car is inherently one of the most dangerous things most of us do on a daily basis, and should be treated carefully and respectfully.