One doesn't have to be affected by rape to oppose it.
I can reflect that there are others whose opinions I value. And thus throw support behind issues that, if left to my own opinion in a vacuum, would be of little concern.
You oppose rape because you know it's wrong. Why do you know it's wrong? Because you know the effect it has on its victims. How does that wrongness translate into a moral stance on your part?
Well, I could care less about most environmental regulation - I rather think it's a waste of time and resources - but I am OK with supporting certain laws that are supported by people who I respect, even though I personally could care less.
My hope would be that people would consider their utility vs. the utility of all those who also want something. I've certainly supported modest tax increases because my neighbors were passionately in favor where my own view would be to oppose it.
Is it too much to hope that people will consider broader societal interests and not just their own narrow ones?
One doesn't have to be affected by rape to oppose it.
I can reflect that there are others whose opinions I value. And thus throw support behind issues that, if left to my own opinion in a vacuum, would be of little concern.