You are making the false assumption that capitalism = free market.

One might argue that after taking into account historical context, modern capitalism is completely opposite to free markets. For example, in a free market, labour unions would be as powerful as the owners of capital - in the modern world, capital owners have a disproportionate influence on law-making to subdue this power. A very good example in the recent past is the wage collusion by Apple, Google and many other companies (working to preserve the interests of the capital owners) to suppress the power of the free market.