Why is it disgusting? In the grim dark future there is only war and everything that comes with it, including rape,abuse and gore.
Why is it okay for dioramas to display mass murder,slaughter,torture but not rape and abuse? I understand this are not part's of the actual hobby, people play games to escape real world problems. But one can not say this is disgusting and has no place in 40k. Its the same as saying its not okay to paint it on a canvas.
Rape and abuse are all real parts of war. The artist presented a less shown part of it and is getting scorned for this. Is it where the truth hurts? Do you think it does not happen in real world? Does not happen in afghan and syria right now? Did not happen in Vietnam? Iraq? WW2? WW1 ?
Rape,abuse,murder,kidnapping,paedophilia would all be a common place in underhives and war ridden worlds all across Imperium.
You are looking at 40k with rose tinted glasses of a world with great heroes, noble deeds and forgetting how dark and sad the that world is.