For the sake of argument, let's say that these women should have been more aware of the potential of being 'roofied'. I certainly wasn't when I was a young woman out and about in the 70's. Does the fact that they were careless, foolish, or naïve mean that they deserved to be raped and brutalized?
This is getting perilously close to 'she was asking for it' territory.
Here's an example: I get blind drunk (never!!) and fall down the stairs and fracture my skull. That's personal responsibility- or lack thereof.
Second example: I get blind drunk, and my husband pitches me down the stairs and my skull is fractured. That's a crime, regardless of my drinking.