Purposeful extremity vs. gratuitous shock
The line between splatterpunk and torture porn is not about how much graphic content appears — it's about what the graphic content does. Purposeful extremity forces confrontation: with mortality, with the vulnerability of the body, with what violence actually costs the people caught inside it. Gratuitous shock asks nothing of the reader except endurance. Every extreme scene should be interrogated: what does this reveal that a less explicit treatment could not? What truth does the physical reality of this moment expose? If the honest answer is nothing beyond itself, the scene is gratuitous. If the scene strips away some comfortable illusion and forces the reader to see something real, it belongs.