Capitalism will always, always, always tend toward monopoly. Antitrust law will never fundamentally alter that tendency because monopolism is inherent in large-scale industrial capitalism. It's a centerpiece of how the system functions. The only real way to abolish private monopolistic power is to replace it with public monopolism with worker-owned and managed industries.
That's a very odd statement. Monopolies can't exist without unusual barriers to entry preventing other companies from arising. No functioning economy, especially one with even halfway decent institutions is going to tend towards monopoly.
I agree with this statement, only because there are some cases where the "predatory monopolies" are only able to compete because OTHER governments are already interfering with markets. In these cases, counteraction isn't really bad or counter to a free market.