Supreme Court of Canada: Who should be responsible

I find this topic interesting and would like your views.  The cbc has a Good Summary of the issue

"Should hosts of house parties be responsible for their guests' actions? The question is before Canada's highest court on Wednesday.

The Supreme Court of Canada is hearing the case of Zoe Childs, who was 18 when a drunken partygoer in Ottawa crashed into the car she was riding in with her boyfriend early into the New Year in 1999.

Desmond Desormeaux, an alcoholic with previous drunk-driving convictions, had more than twice the legal limit of alcohol in his system after leaving the New Year's Eve house party. "

http://www.cbc.ca/...

Those are the facts of the case, this lady is now in a wheel chair.

My thoughts are below ad yours:

I believe every person is responsibly for there own actions.  The debate I have in my head is not acting an action on the part of the hosts?  A know Drunk driver is drinking at your house, would you not make an attempt to stop that person from a Drinking or B driving.  Should you not give more then 2 drinks to someone that drove to your place?

My feeling is that you should do all of those things but you shouldn't be liable if you don't.  I think it is a value judgment with too many unknowns to pass into law.

For example what if someone arrives Drunk (you don't notice) give him/her a couple of drinks they leave and kill someone.  SOmeone say you giving him alcohol....you say 2 drinks his blood alcohol tells a different story and he's dead.  

What do you guys and gals think?