You're talking without knowing the facts. While the image we westerns have about ninjas is largely a myth, what people nowadays call "ninjutsu" is actually a c

You're talking without knowing the facts. While the image we westerns have about ninjas is largely a myth, what people nowadays call "ninjutsu" is actually a collection of techniques that made their way onto modern jujutsu, kenjutsu, etc., plus a variety of more obscure knowledge (exotic/makeshift weapons, explosives, stealth). Calling these people - whose heritage can be traced back to that period - "pajama wearing idiots" is a disservice.