I'm not finished debating~
I've got another analogy! o:
Person A is going to die tomorrow, you know it. Does it make it right to kill him today? No. But you know very well that if you do not kill person A, person B will kill person A. If not B, then C.
See, if I slit A's throat, I have a choice. I can let him bleed to death, or I can press a finger to his would and decide to bandage it up. If I bandage it up, there'll be a scar to person A, a reminder to never let his guard down. But if I don't make the decision to slit him, person B, C, Z is going to come hunt them down with a machete and kill A.
I would rather take it myself, because I know I have a choice of giving it back to them or not. How would I know if B - Z will think the way that I do? How do I know they're not going to steal it? I don't. So the best choice for both me and person A is for me to slit his throat, and I'll decide whether to rush him to the hospital or let him bleed.