The Crater of Diamonds State Park's way of doing things was very cunning, and many people cursed it.
Existing crushed stone hindered the speed of people looking for diamonds. It also lowered the chances of people finding diamonds.
But, they still attracted a lot of tourists.
The park was not bothered by the curses from people. During the past thirty years, the managers had thrown in crushed stones with continuous concentrated effort. This created the attraction of the park.
The park was self aware enough not to throw in the crushed stones without fear. They did it at night when there was no one in the park.
Hence, although people knew about the crushed stones, no one actually saw them, so they did not feel too bad about it.