I think you've got that quote backwards. In full it reads:
> Unequally or unjustly, perhaps, as these laws sometimes operate, and imperfect as they appear to the Idealist, they are, nevertheless, like the highest type of man, the best and most valuable of all that humanity has yet accomplished.
Or (to shorten it a bit): "These laws (of capitalism) [...] are nevertheless [..] the best and most valuable of all that humanity has yet accomplished". So this is only an unlimited belief in the virtues of capitalism, not in the virtues of rich people.
From the introduction:
> Carnegie believed in giving wealth away during one’s lifetime, and this essay includes one of his most famous quotes, “The man who dies thus rich dies disgraced.” Carnegie’s message continues to resonate with and inspire leaders and philanthropists around the world.
I really wonder what Carnegie would think about his successors dismantling USAID?
I believe the connection he was making was that the laws, results, and people profiting from the system all represent the best of humanity. That said, whether read forwards or backwards, the point still stands. I appreciate your attention to detail.