Capitalism is a ruthless, but fair, meritocracy. There is a reason why the guy living under the bridge is poor while Oprah, Bill Gates, and Tom Brady are zillionaires.
Governments can't stand that notion because power derives not from merit, but from control. Ask Hugo Chavez. Taxes, tariffs, regulations, etc. are the government tools to reign capitalism to their own desires. Of course, every time government touches the wheels of the economy, they slow down. The pie gets smaller.