That there's been massive failures in government policy over the decades isn't really debatable, but I doubt the impact of homelessness and crime is that big a

That there's been massive failures in government policy over the decades isn't really debatable, but I doubt the impact of homelessness and crime is that big a factor on prompting families to move to suburbs in most cities (well, at least, in Australia. I'm basing that on the fact that many suburbs with higher homelessness and crime rates are still desirable places to live here, generally with property prices to match - primarily because they're located closer to the city centre with a wide range of transport options to access to various services, unlike outer suburbs that make at best a token effort to support any form of transport other than private automobiles).