Interesting points. I think there’s another angle too. In a world without guns, it’s extremely beneficial to have these skills. But in the modern world, there is not much they can do against a gun. Guns made these skills somewhat obsolete. That’s why cops and soldiers aren’t trained in martial arts, it’s not useful in modern combat. I think it’s similar to the demise of horseback riding after mass production of cars. I imagine people have made similar arguments about people giving up swordsmanship. Training to be a sword master is more about art than self defense.