The problem I see here is that Einstein lacked any self awareness. He doesn't seem to grasp that his mind is an extraordinary one and hence an exception which has led him to conclusions like this...
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This crippling of individuals I consider the worst evil of capitalism. Our whole educational system suffers from this evil. An exaggerated competitive attitude is inculcated into the student, who is trained to worship acquisitive success as a preparation for his future career.
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Now anyone whose actually observed real people knows that competition tends to bring out the best in people (at least in effort not necessarily in personality). But to someone like Einstein who was self motivated to spend most of his life doing "thought experiments" he doesn't grasp that most people need a push in order to perform.
He also falls into the trap of not subjecting his preferred mechanism (Government) to the same scrutiny as he subjects that which he is opposed to. Take this statement for instance...
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Private capital tends to become concentrated in few hands, partly because of competition among the capitalists, and partly because technological development and the increasing division of labor encourage the formation of larger units of production at the expense of smaller ones. The result of these developments is an oligarchy of private capital the enormous power of which cannot be effectively checked even by a democratically organized political society.
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It clearly didn't strike him that the U.S. Federal Government is controlled by an even smaller, more elite group (The Congress) and that they have more power than any private cabal really ever could. I mean, he says private industry "cannot be effectively checked even by a democratically organized political society" but Government can't be checked at all (effectively or otherwise). It is the ultimate power.
In the end Einstein had a theoretical mind and in the world of theory Socialism (and for that matter Communism) makes a lot more sense. That's why intellectuals have been trying to make both work for the last 100 years. But when measuring results Capitalism seems to come out on top.