In fact, I'd argue that some of the greatest rappers actually don't / didn't really feel the need to make light of rape.

For example, here's an example from 2pac (IMO one of the greatest rappers of all time): https://www.youtube.com/watch?v=HfXwmDGJAB8

    I wonder why we take from our women
    Why we rape our women, do we hate our women
    I think it's time to kill for our women
    Time to heal our women, be real to our women