"Under the broken windows theory, an ordered and clean environment, one that is maintained, sends the signal that the area is monitored and that criminal behavior is not tolerated. Conversely, a disordered environment, one that is not maintained (broken windows, graffiti, excessive litter), sends the signal that the area is not monitored and that criminal behavior has little risk of detection."

https://en.wikipedia.org/wiki/Broken_windows_theory

It is 'just' a criminology theory, with many people who disagree with it.