If forced to pick one, I'd say knife (and voted such). The way I look at it, a knife can't kill someone by accidentally being discharged through the drywall.
Also, a knife can certainly do horrific damage, but it starts to hurt as soon as it breaks the skin (most of the time), and so pressure is removed, or the knife is dropped. A kid COULD work out how to switch off the safety, or even do it by random fidling, and if the trigger is pulled the bullet doesn't go slower simply because the shooter was not intending to kill.
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Overhead, the Albatross hangs motionless upon the air,
And deep beneath the rolling waves,
In labyrinths of Coral Caves,
The Echo of a distant time
Comes willowing across the sand;
And everthing is Green and Submarine
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