I think it would be best to de-emphasize the question of blame altogether and have an unprejudiced discussion about how such incidents can be prevented in the future (and great kudos to Justine for trying just that).
The terrifying thing about this is that in the area of sexuality the difference between an exciting, enjoyable experience and a terrifying, traumatizing one can be entirely in the mind of one party and not necessarity noticeable to the other party while it's happening. Especially if both are drunk.
And most women fully expect men to be bold and take the initiative while they themselves give vague signals that are easy to misinterpret. And all of this is pretty much expected to happen while everyone involved is drunk because that removes inhibitions and that's what everyone wants.
I think a large part of the problem is the social acceptance of alcohol and being drunk. Objectively speaking, getting drunk is similar to getting wasted on other (illegal) drugs. Alcohol is a drug which due to an accident of history is legal. The negative consequences of alcohol consumption are ubiquitous. More people die from alcohol than from all illicit drugs combined. If it is wrong to take drugs, it is wrong to drink alcohol, especially to the point of debilitation.
Being drunk should not be an extenuating circumstance for bad behavior, it should be an aggravating circumstance. When people choose to drink something which makes them less able to behave in a socially acceptable way, they should be prepared to accept the consequences.
If the other party didn't bother to ask or pay attention, they shouldn't be having sex. It's like driving with your eyes closed: when you hit someone, the blame is entirely on you.
The terrifying thing about this is that in the area of sexuality the difference between an exciting, enjoyable experience and a terrifying, traumatizing one can be entirely in the mind of one party and not necessarity noticeable to the other party while it's happening. Especially if both are drunk.
And most women fully expect men to be bold and take the initiative while they themselves give vague signals that are easy to misinterpret. And all of this is pretty much expected to happen while everyone involved is drunk because that removes inhibitions and that's what everyone wants.
A recipe for disasters like this, really.