" Killing one person was murder; killing a few or dozens was ore murder; so killing thousands or tens of thousands ought to be punished by putting the murderer to death a thousand times. What about more than that? a few hundred thousand? The death penalty, right? Yet, those of you who know some history are starting to hesitate.

What if he killed millions? I can guarantee you such a person would not be considered a murderer. Indeed, such a person may not even be thought to have broken any law. If you don't believe me, just study history! Anyone who has killed millions is deemed a 'great' man, a hero.

And if that person destroyed a whole world and killed every life on it--he would be hailed as a savior! "

― Liu Cixin , Death's End (Remembrance of Earth’s Past #3)