Right, right.
James R and TW Scott would have stood by watching the slaughter of millions in order to feel reassured that they, at least, were moral upstanding citizens with no blood on their hands.
Still, I suppose the 2 billion or whatever can always take comfort in the fact that these two moral persons were at least very unhappy about the situation, and likely to communicate their extreme disapproval to said demon in the strongest possible diplomatic language.
I suppose you'd have three options really. Let the hundred die, let the two billion die, or take the heroic option and try to kill the demon yourself.
Not sure what I'd do, personally. My first instinct would be to let him have the two billion, mostly due to the fact that I'm not all that fond of the human race anyway, and at the very least it would be a promising start. One could always hope that at the least, the aforementioned two moral citizens would be among them.
"When bad men combine, the good must associate; else they will fall one by one, an unpitied sacrifice in a contemptible struggle."
- Edmund Bourke
*Note - It's unclear exactly who "the good" are, in the above quote, but I would be fairly certain they are not those who stand idle in the face of adversity - nor when faced with a decision.