Plus, from an emotionally-detatched objective analysis, the whole "necrozoo" business is just a bit of harmless fun on the side if you're not a sadist fuck and doing the killing yourself, or have a justifiable cause for it and decide to explore a little bit while at it, with some precautions and safety measures of course. It has about the same ethical implication as sticking your dick in a leather wallet or glove. Literally no living being is getting harmed in the process ;3
Plus the relatives of the dead person might have something to say about trying anything funny with their relative, because humans are a social species who happen to care about our next of kin due to evolutionary reasons and we just act like that. Also, it's kinda gross, really. Animals are covered in fur, so they don't look dead if they just died. I've never seen that many dead people, but they do seem to look very fucking dead when they die. Nooope.
Naw, man. The people who want to duct tape and force-fuck animals are just a small loony minority. Not even I am really on board with the whole "zoocore" shit. However, as long as it's not crushing or poking out eyes or chopping off limbs off living animals or some other sick shit of that caliber, I won't get angry about it. Worse things than being tied up and force fucked happen in slaughterhouses and farms regularly. And except for the snobbish city-dwelling animal rights fucktards, soft-stomached women and hipster trash who are ready to get offended about pretty much anything on this planet, nobody else ever seems to give a flying fuck about it.