What if it was the sacrificed child of your enemy? What if it gave you secret powers? What if it held the key to world domination? Would you do it? Would you eat another person?
You have a lot of question what if there is no need to eat human. But on your question I think it depends on the situation. There is always a change to decide wether I need to eat or not. There was a story ' a people got stock in underground covered by collapse buildings. For 5 days they got survive until 10 days but after 15 days nothing to eat. They cannot kill each other. So they decide to eat a human body to survive purposely. And they survive. In walking dead there is a certain things that they eat human body to survive the day. If for fiends goals I will not eat human. I respect my own buddies.