"Being molested doesn't turn someone gay."
First I heard that one.
From imprinting (same sex) to aversion (so traumatized by abuse from the other gender that as adults they end up seeking homosexual relationships instead), it can very much have such an effect.
Now you might argue causality hasn't been established, that perhaps victims were targeted by some because of what seemed to be the victim's (emerging, latent) orientation, that would be stretching it, and difficult to prove. Might be the case with some, but not all.
I've personally known people so affected by such rape when they were young, so you cannot convince me otherwise. In fact, given the higher rate of abuse people of same sex orientation endure, I'd be surprised if that wasn't a major contributing factor in many, if not most. Again, this would include both imprinting or aversion.
Getting sexually molestated as children is also the chief cause of acting out sexually in many ways, including promiscuity, various kinks, self-destructive behavior in relationships, and involvement in the sex industry, from prostitution to films. That something so traumatic can deeply affect people in ways like nothing else except for orientation makes no sense.