You don't get to decide if it's greed, it's different for each person...I wouldn't push it, and I know most of you would think that I would, but still, say you kill a man who is providing for his poor family, and leaves his wife with 3 kids, no money and no support, killing one life can ruin many more lives and yes WIY it is greed, wanting 1 million dollars, at the expense of a life IS greed.
Besides if it was a poor family and the guy was providing for their family then I'd go give that family 500k :}
See that's not greedy now is it, so stfu :P