Opponents of any kind of gun restrictions, including the safety locks, argue that guns don't kill people, people do. That argument doesn't hold water when children are included in the equation. Children may know that guns are dangerous. They may even know that guns kill. But they don't understand the power they wield to eliminate life- permanently.
Kids can make any object, from their finger to an empty paper towel roll to a real gun- be a gun.
But to children, playing with guns, pretend or otherwise is a game. Nobody really dies. Your best friend still comes back to play with you the next day, even after you killed him. At least that's the way it works in a child's world. However, improper use or abuse, can be fatal, especially to a child.