Any references for further reading on that?

From what I've seen, there are a lot of confounding factors in the studies that both back up and refute broken-windows policing. It can be hard to tell what actually works.

Objections aren't so much suggesting that it doesn't work, but that it was unjust, and New York should have been kept as it was in the 80s because the human cost of the cleanup was so high.

Objections, in particular to Compstat but also to broken windows, are that they don't work.