Quote Originally Posted by Philipvs Vallindervs Calicvla View Post
I used to carry a knife on the farm - since I started living in the city the only bits I use are the screwdriver and the bottle opener, and that's inside the house.

This is, general utility is​ a valid reason, but in the age where libraries will issue you a pen or a pencil sharpener, you almost never need one.
Sure you still do. Opening plastic packages, cutting tape, cutting boxes, cutting loose threads off your clothing, prying stuff (sure, it is not good for your knife, but some times you have no alternative), etc, etc. You would not believe the amount of times I have needed a knife for things I never could have predicted I would use a pocket knife for. It is like a flash-light (something I always keep on my belt except when I am going to job interviews), one of those essential things that even if you use rarely you need there for those important times when nothing else will suffice.