Why do they call it "common sense" when it's so rare?

Once upon a time I loved going on vacation.  Don't get me wrong, vacation time is a glorious gift from above if you are lucky enough to be able to use it when you need it the most.  Unfortunately there is one gigantic downside to any vacation, returning from it.  If you are one of the lucky ones and have an office filled with self motivated intellectual problem solvers, returning from vacation could be a seamless transition.  Or you could be like me and have an office that's more like an emergency room where the motto is treat the symptom, not the source. Copier jammed?  Just unplug it!  Break your hole puncher?  Take someone else's!  Run out of paper in one printer?  Steal it from another!  Could it be that certain people are afraid their attempts to keep things running smoothly will be lacking in comparison to the lucky vacationer?  Or could it be they are just plain clueless?