I on the other hand think that it is responsible people (particularly men as role models) not carrying knives that is part of the problem we now have. I find it quite depressing when people almost boast that they don't need a knife so don't carry one. In my experience, tools, including knives, are something that one learns to do without if you do not have them. Using this as a justification why no one really needs the thing is an approach that could be applied to an awful lot of things that many people would miss. Need is a terrible yard stick when it comes to giving up freedom.
If knives were seen as every day tools, boring items with about as much status a set of house keys, then they would be less attractive to the youngsters wanting to carry to gain instant "respect". I remember as a teen at school, a peer learned I owned/carried a pocket knife and wanted to show me his "knife". Brought it to school. It was some hideously low quality stilleto-look-alike. I distinctly recall I was hugely unimpressed, it was a useless shape, dull edge, wobbly pivot, and altogether impractical. I had owned and carried a SAK and assorted pocket knives, locking and not, for about six years at the time.
I am not advocating that people, now, carry locking knives or sheath knives just incase they are useful, but I am advocating that responsible people do not leave the field entirely, that they carry sub-3" non-lockers every chance they get. That they take the opportunity to show friends and colleagues that knives can be useful, and not these scary things only used to commit crime.