Remaining Somewhat Objective In Scholarly Works

I found G. William Domhoff’s article, Who Rules America, to be informational and somewhat stimulating. I enjoy reading about how the “hyper-rich” came upon their fortunes and how they maintain them. I enjoy reading about the lives they live, the places they spend their free time, and the way they throw around their vast amounts of money. However, the author lost my endorsement of this article in the second to last paragraph:

“Deep down, most members of the upper class think they are better than other people, and therefore fully deserving of their station in life” (page 104).

I would love to be enlightened as to where on Earth Mr. Domhoff found the research and evidence to back up this incredibly general claim about the attitudes of the upper-class. No where in this article is there mentioned anything that could even remotely back up this claim. As far as I can see, this article would read better and would have more validity if he had simply left out this statement. Talk about sticking your foot in your mouth.