Why are governments so interested in breaking up monopolies? To protect the biggest monopoly of all, the government.

The American people are skilled mental gymnasts. They can totally agree that monopolies in the private sector are bad. But monopolies on defense, law enforcement, courts, education, roads, and so on are perfectly fine, even necessary!

This comes down to the myth of the process. People have been convinced that since companies are motivated by profit, they are untrustworthy. Governments are allegedly altruistic, working in the best interests of the people. In reality, the people in government take their profits in power.