We don’t know that the victim was even drinking. She could have had a coke with something in it (GHB or similar) and passed out without having done anything wrong.
We do know that the guy videotaping the event was producing child pornography, and that the guys having sex with a girl who was unresponsive were (1) disgusting, and (2) rapists. I hope all the rapists will be identified, prosecuted as adults, and given long sentences. As a parent of girls, this disgusts and angers me - children should be safe. As a parent of boys, this disgusts me with the boys involved and angers me with their parents - children should be taught to behave decently and respectfully.
From what I heard both girls are pretty decent, from good families and they are both hotties (not that it matters that less attractive women are less human) but these guys were picking out the more pretty girls to prey on.
Decades ago my mother taught me never to drink anything at a party unless I opened the can or bottle myself. Maybe it's still good advice.