Rock has the advantage of being cheap and plentiful. Whatever damage occurs can be fixed with on hand materials.Rock isn't really that useful for orbiting space stations. It would be difficult to construct the proper architecture that is required to provide protection against micro meteorites. Big thick slab walls are actually not that great for high speed collisions.
"And if the people raise a great howl against my barbarity and cruelty, I will answer that war is war and not popularity seeking. If they want peace, they and their relatives must stop the war." - William Tecumseh Sherman
“The market, like the Lord, helps those who help themselves. But unlike the Lord, the market does not forgive those who know not what they do.” - Warren Buffett
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