I don't want to be seen as insulting any particular style. I admit my first reaction to the notion of people carrying around throwing knives for the purpose of self-defense in today's society was to laugh. I apologize for that.
However, I would like to point something out. In terms of legal self-defense in the United States, I do not believe throwing knives have a place used as such.
Why?
Because unlike a gun, or a knife as a stabbing/slashing weapon, a throwing knife must be thrown. To do that, there must be distance between the assailant and the victim who is doing the throwing.
The notion has been expressed in this thread that this is exactly what a person armed with throwing knives does in self-defense; they break contact and create distance, then chuck knives at the assailant.
And this is where, I believe, the notion of LEGAL self-defense breaks down, at least as applied in the USA.
One of our basic notions about self-defense is that it is legal when a person is in great bodily danger. Some states require a victim to attempt to leave first; others do not require it ('stand your ground' laws, etc). But in every case I can think of, if you create the necessary distance between yourself and your assailant before you begin whipping knives at him, you are no longer in the same danger you were in prior to creating that distance.
In other words, if you can run away far enough to throw knives at him, you can just keep running instead.
Personally, I have never heard of someone in the US defending themselves with throwing knives. I guess that doesn't mean it doesn't happen, but frankly, I think the entire notion is in the realm of fantasy. I'm not saying a person can't throw knives accurately, or that it's not an established part of some martial arts, so I am not putting it down; I'm just saying that I don't think it would fly as an appropriate response to an attack in a real-life self-defense situation in the USA.
Sorry, but I could not keep pretending that this kind of fantasy has any place in reality. My apologies if I am offending anyone, I'm not trying to.