I am sick of all of the blaming of everyone else in this country as of late. A while back violence was being blamed on kids playing violent video games, before that it was violent TV shows and movies. This is just another example of the blame game.
Violence toward others except in self defense is not acceptable. Perpetrators of the violence are responsible for their own actions.
That said, it is becoming clear that in this particular case people around this individual were aware of his violent tendencies, as he had made previous threats that were not prosecuted. Perhaps if those threats had been taken more seriously, this individual might not have been out on the streets or have had access to a firearm, and the deaths might not have occurred. As is often the case we all tend to have 20/20 hindsight.
He had recently passed a background check to possess a gun. I'm so glad that we have gun laws to protect us.
(NOT!)
I'd rather trust God to protect me. (And He has accordingly let me have several guns!!)