[creer]

That's fair that perception is often wrong - but that's a different issue.

Perception is also in large part the very thing that matters when it comes to crime. That is, do I get to live in peace or in constant worry? Do I get my property priced "fairly" when I sell or dramatically underpriced because of this perception that the area is unsafe? To summarize, in what you describe "crime stats" are ignoring half or two thirds of the problem.

In San Francisco, "crime stats" are further muddied because of massive underreporting and cherry picking the definition. So called quality of life crime might be considered irrelevant because it rarely causes massive loss of property or injury. But it does make life extremely stressful for the locals (depending on the neighborhoods where it might be "tolerated" i.e. left rampant, or might not be tolerated.) In this case, "crime stats" deliberately not measuring anything very relevant.

See also recent discussion of the squatting issue in Spain.