A million dollars is a lot more zero-sum than not killing someone—if I give you a million dollars I lose a million dollars. To make the analogy more accurate, you’d need to stipulate that Joe will kill me if I don’t kill him.
No, just that you’ll get some benefit from killing him, e.g., you get to have sex with his wife.
No, just that you’ll get some benefit from killing him, e.g., you get to have sex with his wife.