Hey: listen up, Koncerned. Has it ever occurred to you that we live in a gun-profligate and overly-violent society here in the USA? No? Has it ever occurred to you these mass shootings, random ones at that, are virtually an every day occurrence, anywhere, anytime in this country? "You are now free to move about the country", right? 
Youthful "foolishness" is also responsible for most casualties by firearm in this country AND most other places. It's called raging hormones + alienation + not much hope for a decent future + instant gratification/indemnification by violence against others with a firearm. Spurned by a lover? "I'll show her!" Some guy cuts you off in traffic? "Road-rage!" Those school bullies? "I'll show them!" That politician? Again, whether defined as 'terror' or not, it is violence by any other name. Every.Damned.Day.In.This.Country. 
 An insult is a form of violence too. Think about it. What are the odds there will NOT be an Anchorage homicide today? Now go figure...