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I'd argue that posessing a weapon would lend a certian deterrent factor. Someone armed would present a less inviting target and therefore make the assailaint, assuming we are talking a robbery, more likely to break off the attack than they would if they thought you were unarmed.
In the UK if you where walking down the street carrying ANY item that could be seen as a weapon openly you would be arrested or at the very least have the item removed from you. Thus you would have to be carrying a concealed weapon which again is Illegal and would not act as a deterrant.
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I assume the UK will be banning scuba diving because of divers knifes, also all construction (someone might have a battery powered circular saw and go kill everyone with it) Fishing (fillet knives) hunting (Cutting up large dead animal knives) and tea (butter knives could be sharpened and used for nefarious purposes.) Sicissors (people could run with them)
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Scuba knife: Illegal to carry them in the street
Chain Saw: I'm pretty sure if you where seen walking down a street in New York carrying a chain saw the local Police would object. You could hardly call that a self defence weapon.
I realise you are trying to be silly with your other examples, but there is no reason why flick knives, hunting knives or switchblades should be availible to the general public.
I would never condone carrying any item with the express purpose of causing harm to another person, should you do so and in self defence kill someone i would consider it premeditated and you should be charged with 1st degree murder since you acted prior to the incedent to carry a weapon with the sole reason of attacking someone.