Some people can drink in moderation.
The thing is, they don't know they're doing it, they're not making an effort to do it. They don't think about doing it, other than maybe occasionally saying "Nah, I better not have another, I have to go to work tomorrow."
They're not "moderating." That's just their natural drinking pattern.
Some people refer to them as "normies", though I don't really use that term.
Then there is us. I think that if you have to make an effort to "moderate", you probably shouldn't even be trying, because it probably won't end well. Just my opinion though.