Trouble is people always equate the two as being the opposite sides of the same coin - They are not, and never have been.

Communism is first and last a political ideology, Capitalism is commercial and non-political. Totalitarianism is anathema to Capitalism as totalitarian regimes whether Fascist or Communist tend to rely heavily on central control of things. For capitalism to flourish it requires de-regulation to allow entrepreneurial flair to challenge the status quo.