Iron sharpens Iron

There was once a small village surrounded by a tall wooden fence that had been there as long as any of the villagers could remember. A traveler arrived one day and walked into the pub. He asked the locals why the fence was there when it blocked the beautiful view of the surrounding countryside. They all shrugged. No one knew. The fence had just always been there. And every year, people worked to maintain and repair it. The traveler smiled and said, "If no one knows why it's there, surely you don't need it anymore. We should tear it down. You'll have a better view and that will attract more travelers and commerce to your village. Everyone in the village will be better off!" The locals agreed with the traveler. The next morning, they went out and dismantled the fence surrounding the village. The view was spectacular and all the locals wondered why it had taken them so long to do what now seemed so obvious. But that night, while everyone was asleep, a group of wolves entered the village and ravaged the livestock that kept the villagers fed. As it turned out, the fence was there for a reason, after all. DOES THIS APPLY TO CORE?