Comment: Have you considered

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In reply to comment: Sad day when such stand up men (see in situ)

Have you considered

that those men stood by because the biker lady seemed perfectly capable of handling herself?

Not all women are damsels in distress who require the help of men to save them, especially when the attacker is also a woman. Had they intervened, public perception would likely view them as 'chauvinists', 'neanderthals', 'woman beaters' et cetera. Damned if you do, damned if you don't.

As far as passers-by go, it's typically not a very bright idea to go rushing into a fight without knowing the situation. That and the fact that some people tend to mind their own business.

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