I don't think booze is the sole problem.
I have offloaded pax at least twice in recent years whose pupils were so dilated, you could barely see any colour. They take a 'cheeky line' or whatever before they hit security- when you add booze, it becomes interesting. Whatever state they are in at ground level, it is at least twice as bad at 8000' cabin alt.
On another subject, why can't UK airports seal bottles in duty-free? Then make tampering with it in-flight an offence punishable by flogging...