NOW yer talkin'!
Here's the deal; it does not have anything to do with knives. It is about conflicting views of the world and our place in it. We are all subject to forces outside our control (like how tall I am) and other things that we can control (like whether, when something breaks at work, I call it in, or fix it myself). We all recognize both aspects of our lives, but most people tend more to one side than the other. Whether you think it is a good thing, or a bad thing to carry a knife is, in large part, a function of where you sit on the "Stuff I Can Handle Myself Continuum." If you tend toward autonomy, toward thinking of your life as something over which you have the most influence, you will be more inclined to carry tools and other resources with which to exercise control. If you sit more towards the, better call the authorities and hope they get here on time" side of the continuum, carrying the tools by which one might take care of themselves seems silly, even dangerous, maybe even crazy. Thus the annoying question, "why are you carrying THAT THING!?!" There is no way to explain it to the questioner. No explanation will help because it isnt about the tool, it is about how they see themselves in the world (doer, or done to).
Me and mine, we sit on the carry a knife etc. side of the continuum. If the folks on the "someone, please help me!" side are happy, fine. Let them be happy. Just don't require me to join them, because I don't have it in me to lay my humanity down in the dirt that way.
Be well, my friends.