The one common factor between most mass-shooter is their dependence on anti-depressant medications!!

http://www.wnd.com/2018/02/media-ignoring-1-crucial-factor-in-florida-school-shooting/

Every time there is a mass-shooting, the corporate Democrats starts screaming about gun-control, but the big elephant in the room is always ignored by these "outraged" politicians, many of whom are on the payrolls of the pharmaceuticals industry.