So what to do if this is true?

"People act because of the way they were treated by others — i.e., they pick up these behaviors in subconscious ways — and the brain is hardwired to copy other behaviors. Contagion means that something is contagious if it produces more of itself. Flu begets more flu, for example. The same principle is also true for violence, though it’s not true for everything: High blood pressure, for example, doesn’t cause other people to have high blood pressure. With violence, it’s just what we empirically see in nature — the greatest predictor of violence is exposure to a preceding event of violence. We also know there’s an underlying process that causes this to happen: There are neurons on the brain that cause copying, which is the principle way people pick up all kinds of behavior. Violence is a very powerful type of behavior for copying because it’s so electric and emotional that it actually causes even more copying. These are predicable biological processes."

source: http://www.thetrace.org/2015/08/gary-slutkin-gun-violence-contagious-chicago-baltimore/