Three for one offer

An ad for a new book says: "What if you had to kill three people to save your best friend's life, would you do it?"

What if?

What if it were a god asking for the sacrifice of three to save one?

What if your friend were a vampire in need of nourishment?

What if your friend needed the body parts of the victims?

What if it were three demons?

What if it were three turkeys?

What if it were three sentient androids?

What if it were a crazed kidnapper trying to see how far he could push you to act?

What if it were three world leaders the kidnapper was opposed to?