Every time someone suggests restricting outlets & raising prices, out comes the booze reps with other "less Draconian measures". It reminds me of the cigarette companies & their denials of the damage done by their products. Of course these sensible suggestions are always hindered by Government & the drink company "lobbyists" & the usual brown envelope. Sadly when children come from "homes where alcohol is treated like soft drinks, promoted by film & TV as "grown up", while in some outlets, drink is cheaper than water, is it any wonder the survey is so shocking.
While this article is about the UK, I don't think other Anglophones have much to gloat over, Here in the middle of the United States, booze has become much easier to get over the years, It use to be confined to liquor stores, and now it is sold every, including the even more appropriately named, drugstores.
Some of the above outfits do a passable job of trying to stop minors from getting it, but other stores don't. Also, Of course if parents let their children have booze, then it doesn't matter if grocery stores or drugstores do a good job or not of who they sale booze to, if parents give their kids booze.