Although I agree with you 100% hedkikr, there was a post in the Martial Arts forum a while back about carrying a knife and it seemed most of the people there disagreed.
Besides it coming in handy opening boxes, cutting knotted shoe laces, and cutting the security tap off of a DVD movie I've bought I have never had to use it in a self-defense situation. It is nice knowing I have an option, and that I know how to use it.
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You must not fight too often with one enemy, or you will teach him all your art of war.