I don't think there's evidence to bear that out though. Mixed income housing started with a few test cases in the late 90's I didn't get into full swing until the mid and latter portion of the 00's. They would usually tear down one or two developments and leave most of them up in most cities, so it's a stretch to say that's the reason for crime going down.
I think a better explanation is the advancements in law enforcement strategy and technologies. After years of fighting street crime, law enforcement settled on strategies that worked and implemented them city by city. They started aggressively targeting and pinpointing the crews responsible for most of the violence and using every legal method and technological method at their disposal to charge them as an entity as opposed to haphazrdly chasing drugs and doing military-like action. Most high crime neighborhoods have crews of 10 to 15 people who are running the neighborhood and terrorizing everyone. They're more frequently using thr RICO or whatever to take these crews off the street and the data shows crime goes down substantially in neighborhoods when they do that. Until the next generation crew pops up then you get rid of them too.
there is no excepted explanation for the drop in crime of the 2000s, no theory fully explains the drop, thats just a fact, i posted an article about it either here or on sohh
but the drop in crime and elimination of projects coincide with each other, it may or may not be coincidence , i would suggest its not coincidence but there isnt any clear data showing that, so thats simply my opinion
i dont really know much about mixed use housing, i think thats a separate issue, we are talking about projects and the elimination of projects started in the late 90s and was in full swing when clinton left office
but the bottom line is that projects are unamerican and anti black