The modern world is pre-packaged and lots of jobs don't allow or have a need for knives. It's ironic how many great knives there are, and yet most of us can get by without them. Then again, I don't need my seatbelt on most days, but I still carry something.
On most days, I'm a light user as well. I could find excuses to go use a knife, but chores will arise. We have a big yard, and plenty of bushes, sometimes I have to get out the machete. I've been planning a camping trip, soon I hope, and will be teaching my 12 year old cousin some bushcraft. I just have to decide what blades to take, I'll let him use my Becker BK-14 and the BK-2 for fire prep.
Don't you light users ever go camping, hunting, fishing, hiking, or whittle? Used to be a man needed a knife, because of the activities I just mentioned, and farming, gardening, raising cattle, horses, etc...
In the modern city lifestyle the knife is seen as a weapon, because there is little use for it, this thread shows that. I've even gone backpacking for numerous days and only used a knife to cut open my Mountain House meals, what a shame. Those trips were either in summer, during fire restrictions, winter camping with no fire, or in National Parks where I couldn't have a fire. On those trips, I used a tent or bivy, so no shelter was built, why do that when the weather is great?
I have knives that are too pretty to mess up, lots of us do, that's fine. We all want to use knives, and should find some way to do that, even if it's not with your best knife. Anyone can take up whittling, even the city apartment dweller, you can carve soap or cheese for that matter.