Considering challenge 25 is bs rather than everyone just cave in, because someone, somewhere will get done for serving someone they thought looked over 25 and it will become challenge 30, then it will become challenge 30 for cigarrettes, then for buying FHM and porn and anything scissors, and a cutlery set, etc, etc.
if no one bothered to carry ID on them, or at least refused to show it in shops and people stopped buying alcohol for like an entire 3 days, Tesco/Sainsburys/Asda/etc revenues would drop so fast as would tax into the government, that both would immediately jump back to common sense, if they look under 18, and no ridiculous losing a licence just because one teenager looks way older than they are.
Anyway, most of the world realised simply parenting lessons like, make something illegal or "naughty" and your kids immediately want it just to see what it is they are missing. America/UK/places that tend to have stupid high drinking ages and daft laws tend to have the most problem drinkers. Those places that make it just another part of life, it never becomes that symbol of being a badass and wanting to get drunk when you're 15, because every can, and has. Let 15 year olds have a couple beers, and at 20 they won't be binge drinkers, make it difficult to get alcohol at 15, they'll do it far less frequently and go WAY over the top when they get their hands on it, and you've created a binge drinking, blacking out, badly behaving idiot.
If people just refused to go along with stupid stuff, the stupid stuff would disappear.
