Imagine that you and a stranger are kidnapped. The stranger is rigged up to a machine that will kill them quickly and relatively painlessly when a button is pressed. Your kidnapper places the button in your hand and aims a gun at your head. If you press the button, you survive. If you don't press the button, your brains become a work of modern art on the wall behind you.
1) Do you press the button?
2) If you press the button, are you to blame for the murder of the stranger, or is your kidnapper?
3) What about if it was a friend or family member, not a stranger?
2) If the stranger dies, it's my fault. Yes, the person with the gun arranged it, but by pressing the button you chose to take a life.
3) Still no...