80.7% live in "urban" environments according to the census bureau includes all the "small towns" littered across the country. According to the census, "Urban areas" are over 50,000 people, but "Urban Clusters" are areas with at least 2,500 people and <50,000 people, and those "folk" according to the census still live in "urban areas".
Ever been to a town of 3000 people? They usually don't feel very "urban", 2, maybe 3 stoplights, and oftentimes they are the town centers of more rural surrounding areas... shoot, I live in a (small) "city" of more then 25,000, but leave the city limits in any direction and you'll find cows, corn, and forests...
In any case, I wasnt trying to start an argument, just saying, knives never left society. Even in places where laws are strict, say Philadelphia for example, where all knives are banned from carrying, yet many of the 1.5 million people living there do still carry knives. Just more Quietly. I frequent Philly as I have a brother who lives there, and I live only 1.5 hours away, and I don't remember ever going there without a knife or 2 on my person.... now I'm not saying "most" people do it, but plenty do, of that I'm sure. The "deep city" folk I referred to are the ones so caught up in the hustle and bustle of city life, their starbucks, smartphones, and brief cases, the ones who are so completely out of touch on their subway rides they think their food comes from the grocery store, forgetting that someone somewhere farmed it first. Certainly not all city folk are "deep city" folk. Remember that drugs are illegal, yet plenty of people still do drugs, and they are far more "unacceptable" then knives...As for being "Socially acceptable", it depends on where you are and who you ask. Sort of like guns in Cali or NJ vs. guns in TX and Montana...
Again, the market itself over the years will tell you that knives never were "gone" in the first place, despite what mainstream might try to sell, and ergo, can't be making a comeback. They've been here, they've been selling, and people are buying, and new ones are coming out every year, while classics are still proud as ever.