I guess I don’t see an ethical difference between fictional “step” incest and fictional normal incest. In both cases it involves people that don’t exist. Plus all the ethical issues with incest carry over to step siblings anyway. The idea that one is ok and the other isn’t seems really silly to me.

I work in plasma, and deferring donors is by far the most difficult part. I had to send three people home just today for having out of range hematocrit. The look of devastation on their faces when they find out they’re not getting paid nearly brings me to tears every time. Sometimes they get angry and yell at me, and I just let them do it until they tire themselves out because I know how desperate they are. I’m just thankful that I’m primarily a lab tech and don’t have to deal with the donor side every day; I don’t think I could take it psychologically.

There is no utility in punishment. Wanting people who wronged you to suffer isn’t a desire for justice, but a desire for revenge. Dangerous people can be stopped from hurting others without locking them in cages or treating them poorly.