The essence of the bystander effect is that in a situation where someone needs help, if others are around who could help then it discourages us as individuals from stepping in.
While there may be many reasons for this, and it has been replicated in lots of different contexts, a recent study of CCTV footage paints a more optimistic picture. In the study they saw that although the likelihood of any individual intervening may be reduced with other bystanders present, the chances of someone coming to help increases the more people are around. In 9 out of 10 public conflicts they studied at least one person and often several came to help. So the lady in the sketch would probably be OK.
Given the bystander effect I remember being taught that if you are in a motor vehicle accident don't assume that someone has called for help already: it could help to choose someone directly and ask them to call for help to avoid everyone thinking everyone else will do it.
It reminds me of the story about four people named Everybody, Somebody, Anybody and Nobody:
There was an important job to be done and Everybody was sure that Somebody would do it. Anybody could have done it, but Nobody did it. Somebody got angry about that, because it was Everybody’s job. Everybody thought Anybody could do it, but Nobody realized that Everybody wouldn’t do it. It ended up that Everybody blamed Somebody when Nobody did what Anybody could have.
The paper referenced is: Philpot, Richard & Liebst, Lasse & Levine, Mark & Bernasco, Wim & Lindegaard, Marie. (2019). Would I be helped? Cross-national CCTV footage shows that intervention is the norm in public conflicts. The American psychologist. 75. 10.1037/amp0000469. (pdf)
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