Libertarians: You can't regulate companies. Don't you understand the damage that does to the economy? If there somehow develops so much market concentration that one industry dominates the stock market and the CEO of the company everybody relies on for their hardware gets tricked into an extramarital affair by a Chinese spy, everybody should just suffer the repercussions. Anything the govt might do to prevent such a situation would be worse. That's a core commandment of market fundamentalism.