From Arbor Day Site (https://www.arborday.org/trees/treefacts/) :
Trees help reduce crime!
In Baltimore, a 10% increase in tree canopy corresponded to a 12% decrease in crime.
share University of Vermont and U.S. Forest Service, 2012
Among minor crimes, there is less graffiti, vandalism and littering in outdoor spaces with trees as a part of the natural landscape than in comparable plant-less spaces.
share University of Washington
Chicago public housing residents with nearby trees and natural landscapes reported 25% fewer acts of domestic aggression and violence.
share University of Illinois, Urbana-Champaign, 2001