Guns and sharp steel are tricky to manufacture compared to a cosh, which could be as simple as an athletic sock with a few rolls of shillings in it. But by calling it a "culture" I guess they hope to shame people into avoiding it.
The real shame is how they even dumbed-down the common pocket knife so that most ordinary American ones are now considered "assault knives" over there, and can no longer be imported. And pols over there are now lecturing professional chefs and ordinary housewives on "you don't need a kitchen knife that big to cook with, unless you get a permit."
God rest this poor boy with the angels.
Britain has become quite a wild place.