"The burden of proof was on the insurer to prove that too much drinking was to blame."
That is the key statement and not completely unreasonable. If you use unregulated Quad bikes etc then you also aren't covered.
I do wonder how this will pan out once out of the EU. Young Adults go on Malaga/Kavos and older, Bulgaria, type holidays to get completely wasted. They could end up stuck out there.
Sometimes accidents are caused by other people and you should still be treated even if completely off your face.
I'm glad that my Adult children are out of that phase.
"If you swill until you can't stand then you are a dirty skank who needs to take responsibility."
If you are under 25 then you are just a bit stupid, nothing dirty about it.
"Those so pissed they think they can fly between balconies should not be insured. And should pay at a and e."
Teen and just out-of-teens, lads make stupid decisions, especially in groups, they don't deserve to die or end up permanently disabled because of a lack of care, across the EU anyway.
An extra policy could be an idea, similar to what we have to extreme sports/activities, you'll get some insurers offering it for free.
I think that we have to bear in mind that Insurance companies aren't going bankrupt because of drinkers before we take a tough stance. Some resorts advertise themselves as places to go wild and wouldn't exist otherwise.