Если допиться до зеленых чертей, так можно и ботинки своего друга припрятать - дабы не позволить ему пойти гулять в нетрезвом виде. Уж сколько таких казусов дома в России бывает - причем в компаниях, где никто даже не видывал вблизи ключей от машин... Так что все-таки главный "корень зла" - в количестве литров на рыло, а не в лозунге, как думаешь?

Well, here in Canada just listened for a half-hour program about
the court decision to introduce the notion of 'social host',
and hold 'social host' partially liable for drunk-driving problems
after the event. It is civil, not criminal liability.

One decision was about corporate party, where one woman got drunk
and planned to drive home. Organizers offered her
a) call a taxi (I think even to pay for it)
b) call her husband to pick her up
She refused, and got into accident. After that her husband
sued the organizers.
Court held them partially liable, saying that they could do more
to prevent her from driving, in particular, to take her keys away by force !

Second case dealt with some private party, but I did not stay for details.