With respect, that sounds silly. In a slasher film, no one is off-limits. Everyone is fair game to die. That's why Quentin Tarantino will make a movie, say it's good, and have nothing in it but blood, guts, and gore as far as the eye can see through a film lense and yet the people dying in the film is everyone under the freaking sun.
I respect what Colin and Greg did because like I said, they pushed a boundary with those scenes. They were willing to take a risk and they shocked people, like yourself which tells me they succeeded in what they wanted to do.