“There are some evidence-based approaches policymakers could take:
1) Improve the physical spaces that people live around. In many US towns and cities, there are vacant or blighted lots. But what if these neglected spaces were cleaned, greened, and maintained?
A 2018 randomized controlled trial in PNAS found that doing this in Philadelphia reduced crime, violence, and fears of both — without displacing these problems to neighboring communities. The effects were at times huge: Gun assaults decreased by more than 29 percent in impoverished neighborhoods with restored lots.
Experts have several possible theories for why this works, from getting more people in the area (most shooters don’t want to commit crimes around witnesses) to removing a space where would-be shooters could stash guns. Whatever the explanation, it’s a promising approach.
2) Make young hands less idle. A disproportionate amount of gun violence is committed by young people, especially boys and men. One way to stop that is by occupying boys and young men with other things, like school or work.
There’s good evidence for this. A recent study published by the National Bureau of Economic Research found that New York City youth placed into summer job programs through a lottery were less likely to get caught in crimes, particularly youth with previous interaction with the criminal justice system. Another study, published in the American Economic Journal, found that keeping kids in school longer — by, say, raising the age or grade to legally drop out — likely cuts down on criminal activity.
3) Addressing drug misuse. Drugs, including (and particularly) alcohol, can contribute to violent crime, whether it’s by inhibiting people’s judgment, leading them to commit crimes to obtain money for drugs, or fueling illegal drug markets.
A 2020 report from the John Jay College of Criminal Justice highlighted several areas where policymakers could act to reduce problems with drugs. They could limit alcohol sales at a given time or place. They could raise the alcohol tax (though that would be politically contentious). They could support evidence-based addiction treatment, perhaps through public health programs like Medicaid. Overall, the idea is to limit both supply and demand.
All of the approaches above could fit into the “Build Back Better” infrastructure bill that Democrats are working on — whether as explicit infrastructure projects (in the case of greening vacant lots) or through incentives for localities or states to adopt certain policies (like discouraging zoning laws that allow excessive alcohol outlets in an area).
These are just some examples of what lawmakers could do.”