Because if you are under no threat of being disemboweled, then you can joke about it.
If you are, however, under a constant, low-level threat of being raped, then you kind of want people to take that seriously. You don't want people to make light of it. You don't want people to devalue that.
And we, who are not under that threat, can and should respect that.
I am an amputee. The idea that I as an amputee should have the right to stop others from discussing or even joking about amputation seems absurd to me.
I understand the argument about being sensitive to the topic of rape. I do not think that extends so far that no one can use the word except in its literal meaning.
Do you suppose that people who live in war zones are forbidden from making jokes about bombs?
I get what you’re going for and have already stated elsewhere that I think rape jokes are tasteless. But your criteria doesn’t make much sense. Good for you for wanting to be sensitive to others. But if you’re going to be sensitive to others, maybe ask why your care doesn’t extend to victims in general and somehow only applies to this one word.
Why?