I also take issue with gangs being "responsible" for traumatising cities. In U.S. cities, it is common for a successful district to share a border with a gangland district. Usually the crime abruptly decreases at the border of the successful district. The difference is not gang member presence—no repulsor field keeps them from walking across the street. The difference is that the police in the gangland district are not allowed to stop them because that would be "racist".