Well of course we can disagree whether or not billionaires are good or bad. I realize people at one extreme subscribe to the 'red in tooth and claw' natural law view of how society should be organized, and others to the opposite 'we're all in this together' view.

Personally I think the existence of billionaires is a systemic failure, is morally suspect to say the least, and that such extreme inequality is bad for society and slows progress, ultimately.