Please help them. Help the next victim. Do what you can to prevent it from happening again. You are doing the victim and the perpetrator a huge favor, even though it may hurt at the time. The rape you prevent could be your own, or someone extremely close to you.
Most rapes occur from people who know each other.
Someone very close to me was accused of rape. At the time I did not think anything of it one way or another. I was too busy with my own life. I deeply regret not having paid closer attention to the situation. There are different motives for different offenders.