Would you kill someone for valor and protection?
Example: Military, saving your community, becoming a hero
Would you kill someone for survival?
Example: Saving yourself from someone who wants to kill you by means of killing them
Would you kill someone for love?
Example: Saving your family, saving your loved one(s)
Would you kill for freedom?
Example: Liberation, French Resistance to Nazis, American Civil War Fort Wagner
Imagine now that you're yourself. There is a button in front of you. Press the button and only one person anywhere on the earth dies. No evidence of this person's death will point in your direction. You will receive $1,000,000.
Consider your family, do they need the money? Are you desperate?
Consider yourself, are you alright? Are you overly stressed financially? Are the medical bills you may have daunting?
Consider your country or another nation, do the unfortunate people need this money? Could you use it for more good than that other person could ever accomplish?
Consider the person who will die as a result of the button, is it worth it? You'll never know who you killed. Are you that curious that you must know? Would you be more comfortable pretending you killed a notorious human being? What if you killed a good person? Could he even do the amount of good you can do with this money?
Consider the money, what can I do with a million dollars? Will I use this for good purposes, bad purposes, leisure, or to help myself or my family? Do I care if I acquire this money? Do I need this money? Can I do enough good or bad with this money to honor or dishonor the death?
Remember with this sort of decision it isn't a fruitless effort to ask yourself questions. It will benefit you into making the decisive decision.