An elementary school in Albuquerque, New Mexico was the target of a graffiti attack over night. The extensive black spray paint graffiti covered multiple walls and is expected to cost the School District thousands of dollars to clean up.
With school budgets stretched thin, the dollars spent to remove graffiti are reallocated from another priorities. Perhaps a vacant building or some other blighted structure is fair game for graffiti, but tagging on schools, or for that matter, churches, parks, and community centers is vandalism. No matter how good the "street art" is, the costs for removal is real and drain funds away from much needed improvements and maintenance.
From Clean City Innovation Graffiti Watch