https://www.theatlantic.com/magazine/archive/1982/03/broken-windows/304465/
If you worship in the shadow of Rahm Emanuel and the Obama mayor rules cities that spent decades rebuilding are destroyed PDQ.
"Second, at the community level, disorder and crime are usually inextricably linked, in a kind of developmental sequence.
Social psychologists and police officers tend to agree that if a window in a building is broken and is left unrepaired, all the rest of the windows will soon be broken.
This is as true in nice neighborhoods as in rundown ones.
Window-breaking does not necessarily occur on a large scale because some areas are inhabited by determined window-breakers whereas others are populated by window-lovers; rather, one unrepaired broken window is a signal that no one cares, and so breaking more windows costs nothing.