Sorry what proof do you have it's the best system right now? Can you give me an example of a successful capitalist country? Even the US can hardly be said to be a "capitalist" country (see government subsidies, federal bank, social security, medicade). And last I checked, the US doesn't have such a great system, if wealth inequality, health and violent crime rates are important to you. Even if you do think the US has the best-system, that conventiently ignores the likes of other "capitalist" (capitalist-leaning) countries like Brazil.

So again, what capitalist country has a succesful system? Or are you just confusing the theory of capitalism with other concepts like a market economy?