'Problem you guys have over there is that you don't have guns. Bangy bangy, knife problem goes away. Okay, that was a bit of a rouse, nobody should have to fear for their safety while walking down the street. Frankly, I don't leave the house without my knife. I use it multiple times every day. However, I get just as much use out of the scissors as the blade.
Most states over here have laws concerning they types of knives that may be carried, as well as blade length. I think a knife is thought of more as a tool than a weapon over here (at least in the sensible areas of the country). Though I think people in the city would question a guy wearing a six inch hunting blade on his hip. Counterpoint is that I don't even bat an eye (friendly wave, okay) to the person in full camo with a rifle walking down the road in the Stat Game Lands. Everything has a time and place.
Perhaps those hoods should have to face a choice of straigthening out, jail. I don't know, I don't really claim to know since I don't face the same issues that you guys to.