I'm old enough (50) that I grew up taking a knife to school. Sometime in the past 20 years, most schools have banned the carrying of pocket knives under threat of expulsion. I understand this. The proliferation of mall ninja knives marketed as weapons and romanticized in movies, and the ease of purchase and low prices for Asian manufactured "toys," makes it nearly impossible for schools to police their kids. Some schools ban mobile phones for the same reason: it is too difficult to supervise their use, and easier to simply ban them outright.
So many of us grew up carrying a pocket knife to school every day for the most formative decade of our lives. Those of us in Boy Scouts were told that it was a part of our motto: Be Prepared. But now, kids grow up being told they will be expelled if they bring a Swiss Army Knife or scout knife to school. They are formed to believe that knives are not tools, but dangerous weapons that must be policed. And they carry this perception the rest of their lives.
Here in California, I've never received any dirty looks for using a knife in public, or carrying one with a visible clip in my pocket. I lived in Washington for 14 years, grew up in Arkansas and spent my summers in rural Alabama. I see no difference in attitudes towards knives here in California. On the contrary, people of middle age and older seem to expect that men carry knives.
I have recently had older women ask me for help, expecting that I would have a knife in my pocket, because I am a 50 years old man. In my family and social circles, it is still expected that men carry knives, multitools, SAKs.
Of course, there are the so-called tactical knives, marketed as weapons, designed to look frightening or macho, often to extremes. I won't name names, but you know who you are!
It would be prudent as a community to focus on knives as tools. If we teach the use of knives as tools, market them as tools, and carry knives that look like tools (or jewelry), then the unwashed masses will not view them as scary weapons carried by angry men. So we all bear some responsibility for the public perception of knives, and we can change those perceptions within a single generation.
For the record, I like Klingons and Klingon culture, and I think their traditional weapons are cool. But it is make-believe, isn't it?