Nicely put. Many times we find ourselves in situations where we all want the same result but see weigh the prospects of success for different actions differently. It doesn't make anyone evil, just different. For a Bike Forums example just mosey over to A&S and watch the rage between the Copenhagenistas and those who think we don't need extensive off-street paths. Both groups clearly want to get people cycling more and driving less, but they have come to different conclusions regarding how to get that done.

Slightly off-topic: I'm not so sure the Civil War was the most horrendous intra-American fighting. We slaughtered an awful lot of First Americans during the first few centuries of colonization/nationhood.