The idea pornography is responsible for rape is just plain silly. Of more interest is the very strong case that arming women decreases rape by a huge factor (see Multiple Victim Public Shootings, Bombings And Right To Carry Concealed Handgun Laws: Contrasting Private And Public Law Enforcement“ by Lott and Landes).
The gist of this seminal (no pun intended) study is hidden carry laws substantially decrease crimes against persons and decrease rapes by an even larger amount. Even a small number of woman with concealed weapons is enough to cause a significant drop in the rape statistics.
