Will the day ever arrive when human beings collectively decide war is he** and they want no part of it? What would it take to get there?

The use of "they" in your response makes it appear that you assume all people have the same perspective about war, hen in reality, there is a large percentage of people who think the exact opposite of what you've stated. 
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Yes of course.  But I used that to indicate that its part of the human condition.  As is, btw, wanting to live in peace.