On another note, is it not true that bullet wounds occur more to the torso (largest target), but knife wounds tend to be more common to the arms (fending off an assailant),......
I don't have stats, but a professional opinion (military or law enforcement for nearly all of my adult life).
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During both my military and law enforcement experience, aiming "center mass" has always been the norm in training. Of course that doesn't mean you are going to be accurate, but the torso is still the largest overall area. So it makes sense that torso is the most common hit. From gunshot wounds I have actually seen, this does seem the most common location, even head shots seem more common then limb shots. Of course that could be greatly influenced by my law enforcement experience, a.i. people that have been murdered tend to have shots in the torso and head, not limbs.
From the victims of knife wounds I have seen, wounds on arms and hands tend to be quite common, due to fending off the assailant as you said. But, I wouldn't say they are necessarily more common, just a result of the interaction. I
haven't seen a person with knife wounds on the hands/arms, that didn't also have one in the torso (the unarmed person normally loses the fight - the hand wounds are before the knife finally made it to the torso, or after a torso hit when the victim kept trying to fend off repeated stabbing attempts). I
have seen people with knife wounds in the torso, but not on the hands/arms, due to being surprised by the attack.
Again these are only "personal stats", I don't have a large statistic pool.