The concept offers a plausible explanation for why otherwise well-adjusted, normal people may become part of an angry mob at a soccer game - social contagion.
The most crucial thing to understand is that social contagion nearly always plays a role in how peaceful protests degenerate into angry ones. The term "social contagion" describes how unsuitable actions spread when people in a crowd witness others doing them. In a crowd of thousands, a few people's acts may justify the violence. Additionally, when we see others doing it, we get the impression that it is okay to do it now.
Social contagion may be used for good or bad.
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