I would consider moderate drinking to be 4-5 drinks a week (drinking socially weekends). 2 drinks/night is practically getting drunk/tipsy every night. In what world is that moderate?
Maybe if you hammer the 2 drinks and you weigh 100 pounds. But 2 drinks with a normal drinking pace will not get most people tipsy or remotely drunk.
I would guess 2 drinks per night is moderate in many countries. When I was in Italy I observed many drinking red wine in the morning at some cafes.
It does seem, however, that in Italy as an example "The older generation drinks four times as much as the younger generation on average." [1].
A lot of people feel a societal pressure to only drink when others are drinking - special occasions or nights out on the town. Or only after certain times like 5 PM. Personally I think that leads to more binge drinking. I'll drink without worrying if anyone else around me is. I'm an adult.
[1] http://www.latimes.com/food/dailydish/la-dd-italian-wine-con...
That only involves "getting drunk" once a week, which I think a lot of people consider pretty moderate.
This study is not about people dependent on alcohol. It's about people who drink at or slightly above the recommended limits (When the study started the limits were 21 drinks a week for men).