People are Individuals and can’t be reduced to mere cogs in a wheel, they are ends in themselves. Nobody is forced to interact with or morally obligated to one another. Individual rights can’t be sacrificed for “the common good”.
Men have the right to dispose of the product of their efforts and to engage in voluntary, mutual benefiting trade with one another. Capitalism protects this right “by placing the retaliatory use of physical force under objective control” (aynrand.org) to make peaceful trade between Individuals possible.
Note: Capitalism does not mean government intervention in favor of companies or “the rich”, but no government intervention at all! Lobbyism would be no problem, if no one could gain anything from it.
The only task of a proper (i.e. morally justifiable) government is to protect the individual rights of its inhabitants. Which means protecting their right to free trade, free speech and to protect them from violence. A state has no right to “redistribute” the earned wealth of its inhabitants or to enforce arbitrary or subjective value judgements by law.
I’m also strongly sympathizing with Objectivism. A good and detailed summary of objectivisms political and economic principles, with which I largely agree, can be found on the site of the Atlas Society.