Why were they not already doing the same thing to purchase wine and liquor?
Don’t know, but I never saw drunk children. Smoking tobacco was very prevalent in Spain then and most men, I noticed, smoke tobacco. So it was probably due to the acceptability of smoking.
I know from my own family that children generally like sweet drinks. Alchohol products in Europe, generally available as wine and beer, are not sweet unless sugar and/or fruit is added. The wine in Spain is generally quite dry and fruit syrup is added to make it palatable. The only drunks I saw were adults, and they were very few in number.
Marijuana and hash, and I’m no expert on this, are generally not available as a sweet drink.
“Why were they not already doing the same thing to purchase wine and liquor?”
Or the readily available illegal hash and marijuana?