Re: What\'s the best knife for self defense?
Again, guys, threat modeling please. If you think a weapon is useful, let's have some information about what kinds of context you think it would be useful in. An M16 is a superiour self defence weapon, at least according to the Army, but hardly EDC in NYC.
A "surprise close-range attack" is when somebody beans you with a 2x4 and you don't even see it coming, or sticks a knife in your kindneys. People who're trying to kill you aren't going to close in and threaten, they're going to nail you blindside. If somebody "comes up to you and grabs you" you're probably in a bar fight and at little real risk - if they wanted really hurt you, they'd have stabbed you not grabbed you.
If people aren't trying to kill you, what are they doing? In a robbery, is handing over your wallet a better option than getting into a knife fight? Probably in almost all cases. I don't have field experience or statistics, so this is likely inaccurate, but my guess is that most muggings end non-violently once the goods are handed over.
What's left? If it's not an attempt to kill you, or a mugging, that leaves bar fights and real outliers like home invasions, which happen very, very, very rarely.
A lot of what we think we know about fighting comes from two places: martial arts and the military. In the martial arts context, you're looking at "Chinese Army Combatives, c. 13th Century". In the millitary context, it's the up-to-date version. In martial arts, there's no lethal force - how many martial arts feature neck strikes and eye-poking? And in the military stuff, there's only lethal force: the assumption is made that, for both parties, this is a fight to the death.
Neither martial nor military models are remotely close to what actual self-defence situations seem to entail, which is carefully estimated risk on the part of the attacker, and simple "get me out of here" on the part of the target.
Self defence seems to be a very different issue: the problem is not winning fights, but not being in them. It's not overcoming criminals, but avoiding them, removing reasons for them to be violent, and in the last resort, using violence to open an escape route. Again, I'm not an expert, and what you're hearing here is mostly me retreading Marc Young's stuff through my own experience and filters. I've seen some dangerous people up close, but nobody's tried to hurt me since high school, you know? What do I know? I haven't been there, I'm just speculating on what I've read and a little experience in related areas.
All of this is completely different for cops and criminals: for those folks, violence and survival are professions, and graduated force is a core part of the curriculum. But if you're not a soldier, a cop or a robber, I'm not sure that their skills are really appropriate for the scenarios you're likely to be in.
Real violence in this society is done with guns, pure and simple. The elaborate martial arts were from a time before effective firearms, when there really was an incredible virtue in being able to fight very, very well hand to hand: a Samuri was the equivalent of a tank - ordinary infantry would run for their lives, believing they had no chance of survival in an engagement!
But after the gun, it's very different. Anybody who's serious about doing violence is going to have one, and odds-are if they're really serious about doing harm to you, they're going to shoot you before you even know they're there. Ayoob has a bunch of stuff about what happens in gun fights which is worth reading if you're thinking of a defensive firearm, but I don't live in a juristiction where I could carry, and I have a nearly-zero-risk lifestyle, so what's it matter to me?
I guess what I'm saying is this: for my own purposes, I can imagine almost no scenario where having a weapon of any kind handy is going to increase my safety. I do carry a knife. I could use it to hurt somebody, but it's not designed for that purpose. It does make me feel a little more comfortable, but I identify that as the same kind of comfort I get from a roaring fire: largely archaic and rooted in evolutionary history
We're by-and-large pretty safe in the USA, excepting those of us who live in large cities in which you can't carry a concealed handgun. Even there, the actual instances of people being harmed even if they're robbed are fairly low. EDC self defence weapons are, I'd say, more psychological than practical for the civilian population.
I still carry, but I don't kid myself: I do it because I like it, and for no other reason.