How about this, which I forgot to include in the original post:
What about the neighbors who heard what was going on and failed to contact authorities? I can understand not wanting to physically intervene for of one's own personal safety, but anyone can call the authorities anonymously. Considering this is a crime-ridden area, and that the authorities were called to that particular area twice daily on average, then it wouldn't have been out of the ordinary to have a police presence show up.
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