Capitalism is not as good as you think if it comes to the point where 1% of the population owns 90% of the money. It's hard to find examples of honest trade, rather more and more poverty and slave labour while the fat pigs get fatter.
The middle class was created by capitalism, just look into history of the middle class, it arrived with the industrial revolution in Britain and followed from there to the world.
It is socialist states where income disparities are worst.