How did you get to guns when I asked about pocket knives?

Not really relevant to the comment you replied to and only tangentially related to some other comments in this thread. We're talking about knives and soda caps here.

Lol my brother that does not sound simple

Not American, and a pocket knife makes a terrible weapon. There are legitimate everyday uses for pocket knives. You watch too many movies.

A lot of us don't think of our knives as weapons, they're tools.

It's rare that I don't carry a knife, and using it in self defense is the furthest thing from my mind every day when I put it in my pocket. I use it for things like opening packages, cutting string, sharpening pencils, use various other tools on the knife like screwdrivers, pliers, awls, I have a lot of outdoor hobbies like camping, hiking, fishing, and knives are kind of indispensable for those pursuits.

If I'm ever in a situation where I absolutely need to defend myself, and I don't really foresee that ever being necessary, I'm probably not even going to think of using my knife in self defense, I don't think of it as a weapon anymore than I think of my wallet being a weapon, it's just something that lives in my pocket that I frequently need to use.

And knives make a shitty weapon, if you're close enough to stab someone, you're close enough to get punched in the face, or for your assailant to wrestle it out of your hands and stab you with it. You'd be better swinging around pretty much any larger object within arms reach to create some space. They say about knife fights that the loser dies in the street, the winner dies in the ambulance.

The knives I tend to carry especially aren't good weapons, most need 2 hands to open, aren't really designed ergonomically as fighting knives, most are fairly small so I'd have to get really lucky to hit anything vital and would probably just piss them off more and not stop the attack quickly, some of them don't even have a pointy blade so not good for stabbing (I actually make it a point to choose less threatening looking knives for my EDC needs) some of them don't lock open so they'd just as like close on my fingers as cause any harm to my assailant, and some of them actually lock in the closed position so definitely not good for a weapon.

I'm not saying that everyone who carries a knife has the same mindset. Lots of people do carry them as weapons, those people are idiots. And not everyone puts the same thought into the knives they carry and just get something that looks cool whether or not it's functional for their needs.

I also don't carry anything for self defense regularly and don't own a gun (not opposed to gun ownership in general, but my thoughts on that are part whole 'nother debate,) in general if I feel like I need to be prepared to defend myself if I go somewhere, I just don't go there. There's a bit of privilege to that, since I live in a safe area and can make that call, not everyone is lucky enough to live somewhere they can feel safe. The only exception is the pepper spray I keep with my dogs leash, since my wife or I often end up walking her alone at night, and that's more of a precaution against loose dogs, coyotes, etc. than against people.

There's a lot to say about Americans' love of violence and weapons and the sort of mindset we have about self defense, and overall I tend to think that a lot of my country is absolutely insane when it comes to those matters. That said, I also think people who look at the little swiss army type knives, or Leatherman multitools I tend to carry and see a terrifying deadly weapon have their own issues to work out too.