From my understanding of this, it was the Mayor Guilani of New York who took a zero tolerance, rapid response approach to criminal damage, on the basis that (as correctly posseted above), crimes like tagging will encourage more tagging, and the possibility of 'broken window/broken building/broken community' cascades. He implemented the process with the massive cooperation of NYPD, and in a sense 'proved' that when rapid response and zero tolerance are implemented, the problem does not escalate, but will in reasonable time be reduced to a small group of hard core graffiti artists, who operate within a fairly strict code of conduct. ( respecting the graffiti of others, only 'tagging' on non-commercial/non-owned/non-private property). Unfortunately the resurgence of 'old skool' hip-hop among teenage youth brings with it the resurgence of hip-hop gang-culture art. Schools are suffering with it, as the youngsters do not fully understand the 'code' that accompanies the action. The police in Soutwark will deal with offenders who are caught, with Community Service and repeated 'Triage' interviews to encourage remorse, but, as we all know, kids will be kids. Criminal damage it is - at least no-one gets hurt.