I don't blame guns for violent people. I blame anyone who allows violent people to have guns and whats-so-ever.
Same thing with cars. I don't blame the car for crashing into a schoolbus, I blame the stupid driver who went driving whilst being drunk in the first place!

You know why I don't blame objects? 'cause they are objects! They don't have a "Jiminy Cricket" to tell them what's right and wrong. You know who does have that? Humans. The same kind that starts killing their own species.