My stand on this (and I didnt read the whole thread):
I will not take a life, under any circumstance. It is against every fiber of my being to take a life. Even if by taking that life I could save billions of other lives. And, if I knew that somone had been killed to save me, I would personally not take the cure. People die, there is no way around that. You would be taking one life early on, so that billions get to die at a later date....not an even trade off to me.
However, if by sacrificing myself, I could save those billions, I would do it, simply because in that case, even though I might not be morally bound, I would feel responsible for their lives.
A more difficult question to answer would be "If you knew a child would grow up to kill billions, would you take his life"
example: Say you somehow landed back in time, and saw little baby Adolf Hitler, or Osama binLaden, or any mass murderer, would you take his life?
Again, I didnt read the whole thread, so if its just rehashing of whats been said over and over again, then sorry. Forgive me, lifes too short to hold stupid grudges over internet forums.