Carrying a knife is not a hobby. Collecting knives is a hobby. Finding the "perfect" knife is a hobby. Discussing steels and handle materials and custom scales is a hobby. But carrying a knife is not a hobby. For many it's a convenience for every-day life.
For some it's essential. I carry a knife (or 4). I carry a SAK and a multi-tool. I carry a flashlight. I carry spare batteries. I always have a pen. I carry a smartphone with GPS, internet, and a myriad of apps that make my life easier. I consider a knife essential at work. Others do the same job without a knife, but they're always looking for scissors, or something else sharp/pointy to open the dozens of plastic bags that need opening in this line of work (a chain pizza place). They use whatever they can find. A pizza cutter, a dough thermometer (they're pointy), one of the dull-as-a-spoon kitchen knives for prepping vegetables. Or their teeth. Or they just rip it open with brute strength and make a mess of things.
Or they find me and ask me to cut it with my knife.
I don't strut around with my chest puffed out, but yes, I am better prepared because I carry a knife. That's not a statement meant for bragging, it's a fact. I've fixed things at work with my Leatherman Charge or Squirt, or my SAK, that couldn't have been fixed if I didn't have those tools. I've done the same outside of work. I have quite literally "saved the day" for a few people on a few occasions because I MacGuyver'ed a solution to a serious problem. I've even "saved the day" with my smartphone, using it in ways most people can't or don't know how to do because I've gone the extra mile to make it that more useful. The other day I saved my company (or rather, my boss, because losses come out of his bonus) $100 when I used the UV flashlight I keep on my keychain to prove that a bill a customer was trying to use was counterfeit.
Do I take pride in my preparedness/resourcefulness/usefulness? Of course I do. Damn right I do. But validation doesn't come from my own opinion of myself. It comes from a fixed problem. Or from a co-worker, friend, or complete stranger saying "thanks".
I don't need to "get over myself". A knife is handy because my teeth and fingernails are only so sharp. Mankind didn't survive millenia relying on teeth and nails. They made sharp tools out of sticks, bone, stone, and metal, and used them to survive and make progress. Modern convenience has reduced the reliance on the knife for every day life, but the need is still there, and always will be. Everybody at some point needs a knife, or at the very least, their lives would be easier. Even if all they had was a Victorinox Classic on their keychain. And no, I'm not talking about some jackass opening a packet of Sweet and Low with their Hinderer.