Trained or not, an edged tool in close quarters can be used to good effect using instinctive motions. I won't attempt to argue that training won't make someone more effective. But, if you don't believe that a blade is effective. Choose a partner, give them a knife (not a trainer) and try and take that knife away. Bring determination, bandages, a cell phone and remember the numbers 9-1-1.
Well, you're talking about a training situation here, aren't you? I'm talking about the person walking in an empty parking garage or darkened street who is carrying a blade and gets attacked. My totally non-empirical sense--based on a lifetime of watching lions and lambs--is that most people will go down without even drawing that weapon. My concern is--did the fact that they were carrying it embolden them to get into a situation that they were not prepared to handle?
Surely you don't mean equate the ability to use a knife (or even a gun) to that of flying a plane.
Of course I am. However, I'm not talking about the relative skill to use the instrument correctly. I'm talking about the presence of mind to act quickly and decisively under extreme conditions.
I lean strongly on the side of doing whatever is necessary, with whatever tool is at hand, to protect myself (yourself). I can't imagine the scenario where I would shrink in fear because I might not have the necessary or sufficient training to use a tool at hand to defend myself or my loved ones.
That's great, and I applaud you for your commitment. I myself never leave my house without a knife somewhere on my person, and I would use it without hesitation to protect myself or my loved ones. My point is that neither you nor I are the measure by which these situations should be measured. I can easily imagine the scenario in which, confronted for the first time with a dangerous situation, the brave dojo or gun club warrior goes down with his Spydero folder unopened in his pocket.