At the risk of sounding like a cranky old fool, I would argue that responsibility lay with ‘progressive’ excuse-making for criminal, anti-social and deviant behavior — masquerading as open-mindedness and compassion — coupled with a deliberate assault on the standards and institutions of civilized society.

Fact is, like knives, guns were routine fixtures in the lives of my parents and grandparents, but none thought to show up at school to massacre schoolmates or co-workers.

Wretchard is right. It’s a software problem. A virus let loose.