St. Louis Cardinals fans chant “Africa! Africa!” at Ferguson protesters

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114. It is natural

for some people, especially when engaged in a 'tribal' event (such as cheering on their sports team with tens of thousands of like-minded people around them) to react in ways they would not attempt in one-on-one situations where they were not faceless and nameless.

Look at the difference between the racism openly expressed on Internet postings versus what you see in everyday life. Anonymity confers a shield that allows inappropriate things to be said.

Road rage is a more common form of "you get in my face, well, goddam it, I'll get back in yours". This protest at a major sporting event could have been expected to produce a non-sympathetic result. I surmise that the protesters planned it that way, to get even more coverage of their protest.