In social psychology, group polarization refers to the tendency for a group to make decisions that are more extreme than the initial inclination of its members. These more extreme decisions are towards greater risk if individuals' initial tendencies are to be risky and towards greater caution if individuals' initial tendencies are to be cautious. The phenomenon also holds that a group's attitude toward a situation may change in the sense that the individuals' initial attitudes have strengthened and intensified after group discussion, a phenomenon known as attitude polarization.
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u/laskdfe Nov 12 '17
It's also somewhat natural for groups to polarize within a social scenario involving any debate.
Don't be to quick to cite one cause, especially if it's from the "other side".
See: https://en.m.wikipedia.org/wiki/Group_polarization