I'm in agreement with Otter - the general trend that leads to "killing for good" seems to be the dehumanization of a group of people, or at least the categorization of those people as lesser humans. "Us and them" is all about drawing arbitrary lines of moral justification.

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[b][SIZE=2]"Government big enough to supply everything you need is big enough to take everything you have... The course of history shows that as a government grows, liberty decreases."[/b][/SIZE]

-Thomas Jefferson