So I got to thinking (dangerous, I know).

Many ppl rip on the classic knife defenses often found in martial arts. The arguement is that the knife attacks are not realistic (overhead ice pick attack, leading with the knife).

My question is, do any of you believe that there are knife/weapon defenses built in to kata or are the kata geared to unarmed SD? Or, does the kata contain general principles that could be used against both armed and unarmed attackers. If so, why are the classic defenses so bad (as in, not against realistic attacks)?

Hope I am getting my thoughts across, it doesn't sound like its coming out well.
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The angry man will defeat himself in battle, as well as in life. -Samurai maxim