Why does it matter how much of it was due to the writer and the editor? They posted an image of underage porn.
It matters in that you'd probably want to make sure who the "they" in that sentence is before you start calling for someone to be fired, mostly?
I again want it to be clear that I obviously understand what people are angry and absolutely do not think it should have been posted myself. But I want to see what the statement on it is before I'll know how to feel about who was involved.