"why crime occurs" -- because there are always criminals, and they seek out opportunity? How about that?
Ordinary citizens have a right to be safe in their cities.
https://hrdag.org/people/kristian-lum-phd/
I would not call this the profile of an objective scientist. Rather, she's an advocate.
> pretty much everyone in the metro area under study (SF) used drugs, or at least drug use was equally prevalent in pretty much every geographical area and among all demographics.
I call BS on this one. Upscale people in Pacific Heights smoke crack and shoot heroin? Prove it.