Jesus said: “Those who are well have no need of a physician, but those who are sick. I did not come to call the righteous, but sinners to repentance.” (Mark 2:17)
There is a small subset of Christian Fiction which is called Christian Horror. Christian Horror Fiction is about Light vs. Dark and Good vs. Evil. God, Light, Good - always wins. There is no gratuitous violence, cursing, or nudity involved in the genre, or if it exists it is used sparingly. So should this genre exist?
Horrors exist in the real world, whether they are allegorical monsters such as Vampires and Zombies or realistic ones such as pedophiles and murderers. If Christians bury their head and pretend these things do not exist, then we may as well stick with Amish Fiction. Meanwhile these dark things that children have a regrettable attraction to will be shown by secular society to be stronger than Christ. Those lies will be believed by unfortunate souls who hear no argument refuting it. So why not have Christians writing 'horror' stories where Christ wins?
To those who are without law, as without law (not being without law toward God, but under law toward Christ), that I might win those who are without law; to the weak I become as weak, that I might by all means save some. (1 Corinthians 9:21-22)