It's but a different flavor of shock content, duh. And looking at how it made people agitated, i'd say it did it's job well enough. Besides, manga had it from the beginning, and this, most likely, isn't the last time we see it either.
Also, as i already said, the scene stressed out that Raoul's Faith followers are as unhinged as their opponents, and that meshes well with the ending of the chapter.
Honestly, though, i never understood why some people are fine with gorefests, but start throwing tantrums at the mere mention of sexual violence.