I haven't ignored those issues and I've replied to them if you cared to read back. The part of your post I bolded is also about as true as any of your premises and assumptions. You are projecting your mind to "any adult" as well.![]()
Actually, the behavioral change happens universally. It's not an on/off switch; people just begin to take a few more risks, then a few more. They run more yellow lights, even a few red ones. They change lanes without really looking, talk on cell phones, engage the cruise control in medium traffic; in non-auto activities, they indulge in more show-off activities. It's a human universal, and a very interesting and important human psychological problem. (Seriously.)
Backsprings: This is Pinnah's point, and I'm agree wholeheartedly with it. We're not speaking about GEC "alligator" backsprings, but just the normal spring tension that adults don't even think about anymore and forget is a problem for most kids (me included, when I think back).
Kids indeed can learn on any tool, but think that starting with one that has no backstop (= locking mechanism) is a better way to in culcate a small-to-medium sense of fear at a knife's capabilities. A kid who's partially afraid of a knife probably isn't going to get hurt by it; a kid who thinks the lockback protects him is in real danger of getting hurt.
Clearly, good instruction can bridge over a lot of these problems, but how many kids get good instruction?