I think part of it is that people get too wrapped up in their local world and don't see the big picture. For instance "If we don't get this widget added to the thingamabob in the next 3 days the company will go under!" when the thingamabob is just a minor piece of the puzzle for the larger company. Part of it though is driven from the top.
The one downside to having had this realization is it goes both ways. It also means that very few things you do have impact in a positive way as well. For some people this can be motivation killing.