I called a rape help and advice hotline. Apparently it's only for the victims.
That is so tasteless. Are you not at all concerned about the victims of rape by telling a joke like that?
I'm not a victim of rape, so I don't really care, no.
Rape is a serious crime and the victims of it suffer tremendously because of their experience. Just because you haven't personally experienced it doesn't mean that it doesn't happen or cause harm. You should read up on the difficulties rape victims suffer so you can better sympathize with them.
No, I don't think they are suffering at all...
Rape victims for sure suffer, and if you are unsure of that perhaps you can try talking to or watching videos about the experiences of rape victims? After that, perhaps you will learn that it's wrong to joke about such things.