Sorry if you've been checking here only to find no posts, I've been pretty sick all week. I still don't have the necessary energy to dazzle you all with another blinding insight.
But I did mean to link to this paper about bystander apathy. I sometimes tell a story about a guy who shot at someone on campus and nobody did anything, including the two people involved. I also saw footage of a guy shooting at a woman working at a petrol station in America. He also missed and nobody did anything there either. I wouldn't say I get incredulous stares when I talk mention these incidents, in fact sometimes I hear similar stories, but it clearly comes across as weird and possibly dubious.
So I was interested to discover that it's been quite well studied. I imagine that gangsters have been experts on this for thousands of years.