We can blame inanimate objects all we want, the real issue is the human heart. That doesn't mean guns and knives shouldn't be regulated, it just means we're shooting at the wrong target.
Some Americans worship at the altar of firearms - acolytes of Smith and Wesson and Remington. On the flip side, many choose to ignore the lessons of history while marginalizing the foundational documents of our country. Both are misguided and ill-focused.