And how do you prevent big companies to use their money as leverage and lobby to corrupt your government and create regulations in their favor? :/
With representative democracy, socialism or capitalism is all the same. It leads to concentrate the power in few hands, them being corporations in capitalism and government members in socialism.
The end doesn't change, though capitalism takes longer I'd say.
Notice that the common factor in all the different systems you're talking about is state power. The state, and
the corruption it attracts, is the problem, not capitalism or communism.
The inefficiencies created by bureaucratic bloat are destructive to any system as well.
The argument for Capitalism is in the results we are experiencing in quality of life right now.