Simple question. Should the police have responded to the report of a person acting suspiciously in the vicinity of the crime scene or not? Particularly when the person meets the general description of a slender, white male.
Should the police have responded to the report of a person, who didn't plausibly match the clothing description of the suspect, acting suspiciously in the vicinity of the crime scene?
Fair question! To which the answer is: Yes, absolutely, they should have sent a couple of officers to check it out. There was a chance the man in the brown shirt might be somehow involved.
That would have been a rational and proportional response to a report that was interesting, but not nearly as promising as the library report.