That kind of rape is surely metaphorically murder. I think any rape is a kind of murder.
But it is no metaphor when you have a truly dead person in front of you rather than a passed out girl who can't remember anything when she wakes up.
I am mostly addressing the debate over whether the amigoes were cool and collected killers or impulsive, angry, violent teens who went too far and were suddenly without plan facing a dead body.
You see I don't think they planned to kill her. I think they planned to degrade her and enjoy themselves and have somethiing to brag about.
And then there is the Deepak praise..."you the man...you see what you want and you take it."
Young men define reality in sensual terms. They are not thinking of posterity. They are thinking of little willie (or the pleasure centers of the brain that cocaine and X and heroin can probe and push and massage).
Sick...you bet. But real.