Demographics and value systems change over time, should 70's and early 80's developers been held to a more stringent code? Probably, or is it more likely that the resultant sprawl would have still conceded to entropic development and ended up as a high crime neighborhood ever further out from the city center than currently? Crime does equal part or whole of the idea of the urban form; but that is, if anything, a false connotation perpetually blared from televisions. It is a social problem, whereas to react with the skill-set of design is symptomatic of a communication breakdown on a societal level and only produces artifacts of fear. The prevalence of obliques, fractured symmetries, and a general lack of cohesion makes it a cakewalk for criminals to operate in this town. My misspent youth can attest to this. Crime is best dealt with by the idea of surveillance, check your RCP.