At this point, I'm not surprised at all to see at least every couple of chapters, give or take, of this manga to have: sex, violent rape, murder after rape, murder via rape, and/or a few limbs chopped off here and there in all gory fashion, usually the rape-victims or rapists themselves.
I agree with the maid...not all lives are equal. Because the lives of those rapists are certainly worthless (except to maybe test the sharpness of a blade with) when compared to normal people going about their day.