Hey thanks for the info. Food for thought.
However, I'd say from these that it's not clear that observed effects are the result of "changes in policing"; it's a hypothesis, sure, but not with close to the level of confidence you suggest.
The Vox article acknowledges this:
> This is where things get more speculative… We don’t know why BLM protests correlated with an increase in the murder rate, and there’s not a lot of research in this space to help guide us.
and also:
> The good news is that even if Campbell’s finding about the increase in murders following BLM protests holds up to further scrutiny, the effect doesn’t appear to last for long. By year four, Campbell no longer observes a statistically significant increase in murders,
The Guardian article:
> Even if the increase in homicide is significant, there are many competing theories for what may be responsible.
The nber.org URL does not resolve for me.
I guess it would be interesting to compare places with "police-involved shooting" that did NOT have major protests, with those that had such shootings and protests, if the hypothesis is that it was the protests that somehow resulted in... changes in policing... so actually, if the hypothesis is changes in policing, why not actually try to measure _changes in policing_ and correlate to homicide rate, instead of correlating protests and murders and assuming "changing in policing" resulted from the protests as an unmeasured middle step?