Crime in inner cities was really high in general at the same time most of those projects were built so there's a large number of confounding factors. It's likel

Crime in inner cities was really high in general at the same time most of those projects were built so there's a large number of confounding factors. It's likely many of the residents would have otherwise been homeless and still living in violence. Plus modern design philosophy solves many of the issues by making the common/public areas more visible rather than less. Also cameras/CCTV are so cheap now there's little chance of serious violent crime occurring.