When?

"Until recently, most efforts to understand violence and its impact have focused on the direct victims and perpetrators of violence. Beginning in the late 1980′s, however, a new body of research and practice developed, which focused on children who are bystanders to violence. It is now well established that these children, although not physically injured, may suffer lasting psychological harm. Often, their symptoms closely resemble those seen in the direct victims of violence."  This was always a problem it was just ignore and was view as normal back then. Kids can go missing Then people think they run alway. They use forces kids it slavery. some kids were killed during the holocaust others from war and acts of terrorism. 

Lets it stop there, Because we slowly moving on from that and we can keep improving from there. 

http://www.childwitnesstoviolence.org/social-impact--history.html