This article popped up yesterday via Twitter IIRC and comes from an advocacy group on gun control - which I've not seen before - and is useful as it provides some options to prevent violence.

The title is:Anger Is the Shared Fuel of Mass Shooters and Everyday Murderers. Here’s What Might Stop Both; The post-Orlando debate is overlooking policies and programs that can prevent rage from boiling over into gun violence.
Link:https://www.thetrace.org/2016/06/ang...ce-prevention/
It is also appropriate after yesterday's shooting @ Alexandria, where the suspect appears to be an angry loner.