One of your friends has been shot in battle, and a field medic told you he will be paralyzed from the neck down for the rest of his life. This is a post-apocalyptic world you are living in and your friend asks you to please have mercy on him and put him out of his misery. His wife and kids have already died and all he wants to do is be with them instead of living in a world as unforgiving as this. Would you have mercy on your friend and kill him or would you let him live? Why?