rodney:
all the reporters eagerly accepted a glass!
Have you ever met any reporters? ;-)
I believe there's less all-day boozing in journalism these days, but if you listen to old British journalists talking about the pre-1990s days, when the UK newspaper industry was centred on Fleet Street in London, it's clear that most of them were "three sheets to the wind" for much of the working day. Many were functioning alcoholics, who saw it as a point of pride to be able to produce copy whilst drunk.
Even allowing for a certain amount of macho exaggeration in their accounts, I think it's fair to say that over-consumption of alcohol and journalism used to be fairly synonymous.
That's how it was in the UK, anyway. I wouldn't know for sure if Belgian gentlemen of the press had the same reputation, but looking at this scene in
Picaros, I'd guess they did!
rodney:
Hergé put this in as a further way to show how the Captain can't handle his alcohol any more, a plot device.
I think your last thought is correct.
It would be unusual (in the UK, and Belgium, I think) to offer guests - even journalists - an alcoholic drink that early in the day. I think you're right that Hergé was using the scene to show another example of Haddock no longer being able to drink alcohol, thus building up the mystery of that plot thread.
Also, I guess the fact that Haddock's so keen to use the journalists' visit as an excuse to get the whisky out so early in the morning usefully establishes to readers that the Captain really is still a functioning alcoholic, rather than someone who just likes a drink in the evening.
We need to know this so that Calculus's decision to "cure" him without his permission makes sense when that's revealed later.