I know that in the past, into the 1950s at least, it was not at all uncommon for non-locking pocketknives to be used for 'knife fights' (mostly involving cutting as opposed to stabbing each other) and such in rougher areas. Besides the Texas Toothpick, the Barlow was also commonly used as a weapon, as well as stockmans, etc. I've even seen old hospital photos from the '40s or '50s showing what looked like a medium stockman with the clip point blade driven halfway into a man's skull. We have to remember that prior to the 1960s, folders with locking blades were not that common. Sure, there were the cheapy switchblades, but mostly those were looked down upon. Plus, those switchblades had little to no utility value. Folding straight razors were also very commonly used as weapons.
Unfortunately, in the '90s, I saw film footage of an approximately 16 year-old boy who had been killed by his drunken father. The weapon? A standard-sized, red-handled, non-locking Victorinox SAK.
I personally carry my knives, whether traditional or modern, as tools. My EDC sometimes varies depending on what I think I might require for that day, but usually remains fairly consistent.
Edit to add:
I've never owned a smartphone. I'm still on my second cell phone, a flip-phone I bought "new" in 2006. I have no idea how to even operate a smartphone/iphone or whatever. Also never taken a 'selfie' with a phone (mine doesn't have a camera). I guess I'll see how long it or its battery keeps working before I finally have to replace it/upgrade.
Jim
Okay, Being an old codger from that era, I'll try to explain it. People back then did not have the money the people now seem to have. Especially young guys, who did not have nearly a fraction of the disposable income they have now. People now are like spoiled rich kids with lots of toys. Back then, if you wanted to go deer hunting, rabbit hunting, squirrel hunting, or duck hunting, you used the same gun. You had a shotgun. You didn't have a rack of enough firearms to equip a Marine rifle squad. For small game you used bird shot in appropriate sizes, and for big game you used buckshot or slugs.
Same with knives. People didn't collect knives then like now. The local hardware store had a display of Case, or Schrade, or maybe even Camillus, and that was that. People had a knife. That's "A" knife, singular. If something happened to that knife, or it finally was worn down to a skinny steel toothpick, they tossed it in the tool box and bought another one just like it. When I was kid, I got to spend summers down on my grand folks place on the bay. These were working watermen who made a living, just. Crabs in summer and oysters in winter. They used that one pocket knife for any cutting job that came up. Out on the boat, they had a tin bucket with some old butcher knives they used for bait. These were old knives from the kitchen that had seen their day, and were condemned to rust away in a bait bucket.
When a rough old cob of a waterman or farmer went to the water hole for a drink or four, his everyday pocket knife was with him. After enough booze that he was drunk, and had a serious disagreement with another drunk old cob, and fists were not enough to settle it, whatever pocket knife was on him was drafted into service. Toothpicks and Barlows were used a lot, because that's what people in that neck of the woods were carrying in their day to day life. That they didn't have locks on them was no matter. These rough old cobs used a knife everyday, and knew how to use them. They lived and died long before there ever was a tactical knife craze, and didn't care. They knew that with a knife, you cut to the hard, and thrust to the soft. They hadn't watched senseless youtube videos or Hollywood movies with scripts written by idiots who had never seen real violence.
With a pointy blade like a toothpick, stabbing a soft target, like a stomach, is like sticking a screw driver into a bowl of spaghetti. The toughest thing is, going through whatever shirt/jacket the guy has on. The knife is not going to magically fold over and cut your fingers off. Rib cage, maybe, sternum yes. Belly, no.
There was this place down by granddads place outside Cambridge Maryland, called Tinkers. Tinkers was a low down dive, with peeling plywood construction, and the scum of the earth hung out there. People that weren't allowed in any other bar in the are. They kept Tinker's open because it kept the bad apples in one place and it they killed each other, no big deal. It was common place to see the Sheriffs cars with the gum ball light on top rushing down there, followed by an ambulance. People got knifed there very often, and 9 times out of 10 it was a toothpick. The poor man's fighting 'fishknfe'. They were cheap, and easy to find at most places that sold fishing gear in those days. It had a nice long blade with a fine point. If it was a barlow, it was probably bought at the local hardware store and was the guys everyday pocket knife. If you were just defending yourself from another drunk with a knife, again, you don't need a lock. With sweeping slash movements against an incoming arm/hand holding a knife, the forces are going against the cutting edge and not the spine. I know, heresy to the tactical crowd that spine whack's to test lock strength. Plenty of those drunks fighting at Tinkers got cut good by knives that the prac/tac crowd would scorn. A few even got killed. It's a shame those old watermen didn't realize they were using the wrong kind of knife to slice and dice each other. They just had a pocket knife they used everyday, and knew it's limitations and how to use it effectively.
Just like that old shotgun that fed them everything from roast venison to a duck dinner. Just changed the loads. They knew how to use what they had. Knife magazines had not come out yet, and they never knew how under equipped they were.