@yaps Pretty much. Brother kept losing his shit and killing people whenever she got raped, so my I guess is he finally figured out it was easier just to kill her instead of killing all these rapists. I mean, props for efficiency I guess?
@Mr.Heartbeat I don't think he was "sick" in the "he had an illness" sense, I think he was sick in the "psychopathic killer" sense. The Japanese text is also unclear about this.