I've never seen a gun jump up and kill someone. I have many and none of them have ever decided to shoot me, or anyone else. It takes people to operate them to do so.
I've never seen a car drive along by itself and deliberately run someone over. It takes a drunk driver or madman to operate it and do so.
I've never seen a bomb make itself then bury itself on the roadside waiting for someone to roll over it. It takes people to do so.
Common theme here. Hmm, interesting.