New York, June 22 -- Last year, of the more than 25,000 violent crimes reported in Los Angeles, more than 70% were in South Los Angeles.

And then the domino effect comes into play. Gang and drug activity, coupled with unfavorable socio-economic factors, led to increased tension, conflict and misunderstandings between police and residents. People who fear crime become less active and children exposed to violent crime often display early signs of aggression, depression, and anxiety.

First responders are also not immune to the psychological impact of violence, as responding to such service calls affects an officer's mental health and well-being.

Mandar Apte, former Shell GameChanger innovation manager and now executive director, Cities for ...