I propose a thought experiment;
Imagine a world where guns are not available, and nobody is able to get one. In order to kill, someone has to really want to do it and be willing to get close enough to, for instance, stab someone. (the crossbow argument does not hold, those things are not easily concealed and can't go full auto, but for the rest of the experiment, rule out all ranged firearms. The car argument does not hold either, as A) the car's purpose is not to kill, as it is not created to be a weapon, B) most cars make a lot of noise, you can usually hear a speeding car, and C) ramming someone with a car again requires you to get in close range of the target as you speed closer, plus speedy cars are hard to maneuver outside of long roads and highways.)
Now in stead imagine a world where guns are freely available to everyone. The instinct to arm yourself to match the arms of other people drives everyone to own guns, and everyone can, at varying range, kill people. Where ever you go, a gun could be nearby, and you are driven to always carry gun on you, just in case you need to match arms with someone else. It all comes down to who draws first, which is unnerving to almost anyone. Some of the most effective killing tools around, whose sole purpose and design is that of maiming and killing (target practice aside) are everywhere
Which world do you prefer living in?