I think more people would be backing this guy up if he had shot a BG that wasn't his flesh and blood but was confirmed to be a serial rapist and sometimes murderer.
Blaming this guy is wrong and basically couch potato monday mrng quarterbacking. He tried to do the right thing. He probably received an extremely frantic phonecall...most women and people know many times these frantic calls are happening while the woman is shot dead. At any rate, one would have to ask the dad what his thoughts were when he pulled the trigger. I guess he feared for his life, but I am sure he is monday mrng quarterbacking it himself. This doesn't change the outcome.
"Damn the torpedoes, full speed ahead!" -Admiral Farragut @ Battle of Mobile Bay 05AUG1864