Just like the last necrophilia post I responded too I'm not going to give a value judgement but I'll say I concur with the "sex dolls can't consent either" argument OP made. But I can see how normies can argue a necro is severely mentally ill.
We must also not forget most necrophilia in the real world is morgue workers doing things that severely breach their jobs terms of service and what the family wants. So if you want to defend necros you need to address the ethics of morgue workers, we must also acknowledge those guys might not be true necros just horny opportunistic offenders (similar to child molesters) with access to a one or two day old body because they aren't into rotting corpses or the decomposition process. We must also separate romantic fiction on necrophilia from people who actually want a corpse. Some people will read deviant art fan fic on the topic and not dare engage it irl. We must also look at proto necrophilia like kissing a dead loved one, one last time.
Pedos should not be super close to necros, its contrary to our interest. But its perfectly fine to bring up the neuroscience of disgust to throw them a bone once in a while. Since we know disgust and sexual arousal are so strongly connected in the brain working as antagonistic forces, perhaps disgust and arousal which are normally antagonistic forces can cross wire explaining why some people are sexually into corpses, vomit and feces. I keep stressing girl and boy lovers should NOT team up with necros. They have their own problem to solve.