As he said "given the pleasure presumably associated with moderate drinking" he isn't talking about practical needs such as getting to work. Some people drive for pleasure rather than (or, far more commonly, as well as) to serve practical needs.

The same could be said for any leisure activity: I run, study & practise medieval swordsmanship and other history martial arts (and more modern sports wrestling). Other people play football (UK/Europe/...) or hand-egg (US) or other competitive sports, there is horse riding in various forms (all potentially quite dangerous without adequate experience working with the horses), and dancing (the effects of which may be additive with the risks of alcohol!), and many other activities, all of which have no safe amount if you want to 100% remove risk (unless by some complex statistical analysis you prove that the increase in risk for injury/death due to the activity at the participants current age/health is less than the decrease due to the potential health benefits of the activity).