How much is rape displaced vs reduced, when a potential rapist decides not to target a potential victim? You're sort of assuming 100% displacement here.

Very much worth looking into more, IMO, but I'm not sure I assumed this that explicitly. If you change "to someone else" to "to someone else or not at all" in the last part of the grandparent, it counters the 100%-displacement notion more explicitly, but "K selects for X as targets to do Y" doesn't necessarily imply displacement.

Nevertheless, it's something worth distinguishing when trying to do utility estimations.