Here's an extreme example to make the point: we pay soldiers to kill people and destroy property. At the level of our "business" (our country) this may increase "value" (our security), while at the level of "society" (the world) it may be a net loss and an enormous tragedy. The problem is that this whole idea of "the good of society/the world" is extremely fuzzy and not that useful. It presupposes the only worthwhile actions are those that increase the utility function of the entire world, which we undoubtedly lack the knowledge to do. Capitalism is just a best-try approximation at achieving that and seems to have more success than other systems we've tried.
