I suppose that you are right. If it’s a disease that causes people who are alive to become zombies, then the zombies are still people. However, assuming that the zombies are uncontrollably aggressive, the just defense theory would apply.
I also like how you brought up the possibility of it being a result of demonic activity. That was not something which I considered. I think that a demonic zombie apocalypse would be somewhat trickier. Based off your username, I would assume that you don’t believe in demons or demonic activities, but we as Catholics do believe that Satan exists and is evil. If a satanic zombie apocalypse broke out, there would have to be several questions that need to be asked:
- Does exorcism work? We as Catholics believe that Christ can drive out demons, for example Legion, and that this power was conferred to His church. This is why I believe every diocese is required to have a priest who specializes in exorcism.
- Would there be a physical way to cure it? For instance, maybe medicine or a chemical compound?
- To what degree is the zombies’ free will inhibited? What is their moral responsibility?
- Are they reanimated or just sick? Is this a biological phenomenon or just basically mass demonic possession?
This also makes things somewhat easier yet harder for me to stomach, especially if this is not a biological phenomenon and instead is wholesale demonic possession. Because if exorcism can completely heal them, then we should try to exorcise them instead of killing them. That being said, they should undoubtedly be killed if they pose a threat which we cannot contain. I don’t think that this will ever happen, but if it does, I hope that it is demonic reanimation because that would be the easiest to justify killing.