Are you trying to say that unregulated monopolies like US Steel, Standard Oil, the railroads, AT&T, American Tobacco didnt have the best interests of the public in mind? After all Carnegie gave us lots of libraries and without Rockefeller we would not have had the Rockettes.
I can't comment on the other three, but Standard Oil was fantastically good for the United States and the world. I'd really recommend the biography "Titan" by Ron Chernow about John Rockefeller's life.
Tons of advances in efficiency, chemistry, operations, logistics. Oil prices fell dramatically, consistency and quality went up, supply went up through all of Standard's monopoly years. Breaking it up was far more about political factional conflict than it was about problems for consumers.
(Preemptively: Before anyone decides to jump on it, Rockefeller's rebate deal with the railroad wasn't above board. But Standard Oil was a huge net gain for the world. Absurdly so, actually.)
