Violence

This article talks about how many different things we do and things we use affect human nature for violence.  Like how X-box games can actually help transfer negative energy that would fuel anger on the streets like gang violence and domestic violence.  With a way to channel all of your anger and curiosity towards video games on the Xbox children/ young adults stay away from crime.
Another statistic that proves to show lower crime rates in cities is the destruction of housing projects.  The reasoning's behind this is because it takes the group of people from a small concentration of people in an area where they can cause many conflicts.
In this article it also says that leaded products such as gas, paint, and heavy metal can cause lower IQ's.  These have been linked to lower IQ levels for a long time for children that have been exposed to heavily leaded products for a long period of their lives.  So with taking out all of this lead out of these products they have proven that it helps lower crime rates and higher IQ's amongst the population.
The article also talks about how immigration actually helps build family structure in the United States.  Because it is found that families that come to the United States have strong ties in their family creating a strong family and making for a happier family.  This actually helps lower the crime rate in the United States because a person from a strong family bond is more likely to stay away from crime affiliated things and tend to stay in school.
In the article it has a section call "Home Bodies" that says during the Great Recession of 2008 police and researchers waited to see if there would be a spike in violent, but were only amazed to find there really wasn't. Because people found themselves staying at home because they had no where to go cause they had no job.