I have to let Mr. Eastwood off the hook here a little bit. Clint was not obsessed about rape, well...maybe..but at the time he wasnt the only one.
The feminist movement gained real ground in the sixties and its effects in cinema were showing thru in the seventies. Before this rape was terribly portrayed in movies like "Oh she was raped ..but.. give her a nights rest and she will be back to work tomorrow"...completely devoiding the psychological effect it had on its victims.
The psychology of rape became an overcompensation in movies AND in tv, to try to restore some balance to the terrible narrative that Hollywood had set before hand. Clint Eastwood, in my opinion, always saw himself as a socially conscious person. Even in the Dirty Harry character, there was more to his psychology than "Brutal cop big gun shoot bad guys", and with each DH series the progressiveness showed. Having a hispanic then a black partner, then a woman partner (all of these things were unheard of at the time these movies were made). I think C.E was trying to do his part to oversteer and correct a terrible narrative.