I carry a knife because my late Grandfather taught me to carry one when I was about 10 years old. I am very grateful to grow up around an old school guy like my Grandpa. People have changed a lot from just a couple generations ago. Without my Grandpa I would have missed out on a lot great teaching.. I think everyone should carry a knife, I get asked to share my knife all the time by people who would never carry a knife. Why they don't carry one I don't know, but people who know me always ask to use my knife, because they know I have it on me. Yet they wont carry one them selves. It's like with other tools, how often you use them varies, but when really need it, it is priceless. I have tools in my tool box that have been used only a couple times, but man is it nice when your car is all taken apart, and you have the right tool at the right time for the job. I prefer to be prepared, I don't like to rely on someone else to have what I need, and a pocket knife is so easy to carry, with the right one, you don't even notice it is there.