I think I agree, but I’m not sure how that fits into the conversation. The OP was marveling at people who don’t drink heavily (and attributed their casual drinking to puritanism), not those who abstained altogether. People who abstain altogether in my experience are either religious, recovering alcoholics, or people who have been close enough to alcoholism to keep a wide birth. In my experience the latter camp is significantly bigger than the others, but that could be unrepresentative for any number of reasons (e.g., I don’t happen to hang out with many devout Muslims).