I've noticed a tendency many people have that is interesting in the extreme. People tend to turn each other into "mirrors" without thinking - almost on a subconscious level. Mirrors in the sense that, in the back of their minds, people think others have the same set of beliefs, values and morality as themselves. When pressed or in acute conflict people will state otherwise but by their actions and words they betray their belief that other people are just like themselves and when there is evidence to the contrary it's just an aberration and the rest must surely be equivalent. The other party will surely come around to the "correct" point of view.
If the evidence to the contrary persists then the mirror shatters and the US/THEM paradigm is embraced. This tends to amplify the tendency of people in the "US" group to turn each other into mirrors. Of course all those awful people in the "THEM" group must all be "wrong" in some homogeneous manner as well. ;)
Blankets like Politics and Religion are prime fields for this behavior.
Tendencies like "mirroring" that encourage the transformation of groups of individuals into a homogeneous Mob should be subdued while those that allow individuals to celebrate each others differences (as well as similarities) should be reinforced. The cultural pressures all seem to pull us in the opposite direction and it is up to us to see something more than just our own reflections around us.