That's not the issue here. I don't see it implying rape is justified. I see it implying there was no rape at all. Now if you're a victim of veritable rape, I imagine you would take it to mean exactly how you've characterized it, but if you're the accused its a whole different story now, isn't it?
How do you determine whether it was rape or not? You question credibility... and just as a verifiable history of filing false claims serves to question that credibility, so does a history of consensual sex with the accuse serve to paint a broader picture of the situation.
Just to clear something up, I would never, EVER say or imply that rape is justifiable. However, I don't think trying to determine the situation and the cir stances by asking what I think are very relevant questions is justifying rape. For example, determining what the accuser was wearing that night doesn't mean that IF she got raped, what she was wearing made it justifiable, it just serves to provide a reasonable analysis of a situation in where consent could very well have been possible... If a girl dresses in skimpy outfits to garner male attention, chances are she COULD have been looking to have sexual intercourse. This "reasonable doubt" about the nature of the intercourse is relevant I think.