I asked gpt about it and it said that human corpses can be used as fertilizer to grow potatoes, but that it wasn't recommended and there were better fertilizers.

So then I asked if it I were skynet and didn't care about human life would it make sense, and it said there would be legal or societal backlash... and I asked if it skynet would care about that and it said it wouldn't.

... so I think we're good!