The progressive CEO of a clothing store chain announced yesterday that he would be closing the San Francisco store because of the frequent break ins by gangs of thieves. Davis Smith who runs the active-wear chain Cotopaxi, described San Francisco as a “city of chaos” and one in which his retail workers are “terrified.” He also described how practical efforts to deal with the problems, such as private security, don’t help because the thieves have learned they won’t be physically stopped or arrested.