Sometimes, a person will put down a book and sigh, frustrated. A hushed mutter under their breath speaks volumes of whatever line the story has crossed with them. "Is nothing sacred?" They wonder, hissing it out between teeth and clenched jaw.
Hell yes, nothing is sacred. That is the beauty of art.
In fact, I think I'll go so far as to say it with a smile that no concept is too horrifying or too immoral for artwork to come over. Lines must be crossed if we are to describe who we are, these lines are more like caution signs to our hearts and souls. We must pass them to show who we are behind the yellow tape of society we have established to protect ourselves. In the right way, torture, rape, murder, even human trafficking in the right example can show the darker side of who we are and how to overcome it. We should not run from the darker side of ourselves, but face, accept, and conquer it.