Once upon a time, long ago when I grew up in this country, if a man had pants on, he had a pocket knife in one of the pockets. Not that it was a dire need, but it does make life easier if you have to open a package, or have something to cut.
Then once or twice in your life, a life may depend on a sharp edge. Not often, but it does happen. Twice in my life, I need a knife to free someone from a bit of trouble. The first was a child who got a loose shoelace stuck in the treads of an elevator. It got to the top and was pulling the child's foot in at the top. The sheepsfoot blade of my Buck stockman cut the laces, and the kid got off with some bruises on her foot. The second time, the driver of a car passed me on a winter morning going like a bat out of hell, hit an icy patch and spun the car, then rolled it coming to rest against the guard rail upside down. I had to crawl in and cut the belts holding the infant init's car seat, then cut the over weight mother loose. With all her weight on the seat belt, I didn't have a bionic thumb to press hard enough to get the buckle to release. I used the Buck stockman to cut the seat belt so she could flop free.
I'm 70 years old, and in my time on this rock, I needed a knife right then because nothing else would do. It was there in my pocket. I don't think I ever will be needing a knife again that badly, at least I hope not, but life is like a card game. You never know what hand you're going to be delt when you walk out your front door in the morning. Better have a sharp cutting tool and not really need it much, than not have it at all. A small pocket knife does not weight much, but sometimes nothing else will do.
Carl.