As I understand it, rape use to be a capital crime in America but society's values changed on the subject thinking the death penalty was too harsh a punishment especially in light of difficult to know for sure circumstances. Juries began aquitting rapists to keep from sending them to their deaths. It's a sad state of affairs as statistically rape is a crime most perpetrators do in fact get away with.
Law enforcement, the courts and society in general have failed in protecting our mothers, sisters, daughters, wifves and girlfriends. The best advice we can offer if to have our female loved once to stay alert and avoid situations that make them vunerable. Carrying pepper spray might be a good idea.