considering we're not able to discuss the moral or even economical implications of this, (thanks steve for trying though), let's at least consider one example how income inequality can be a good thing for all.
among those "families" that control whatever seemingly disproportionate % of the American economy we find the people at google and at microsoft. they didn't inherit their assets, and their fortunes are as gigantic as their contribution to the general public. Incidentally those companies and others couldn't have been created, and their inventions wouldn't exist or wouldn't be widespread if it wasn't for the market economy and its airport traffic tower, that is, wall street.
Hero invented a steam machine but society could not accommodate such invention until some form of free exchange, capitalism, arose in Britain 1700 years later.
@joe I don't wonder why they're protesting. Everyday existence can be excruciatingly boring and parading in the streets against a common enemy (more likely than for a common cause) is a diversion that many people will get excited about when they are provided with the opportunity by the powers that be. Neither these protests or the Arab spring were "spontaneous". Notice that where it didn't work change is indeed being forced? People behave this way when they are allowed to, through war, revolution (coup d'etat or planned conspiracy), or, as seen in b.a. routinely, "marches" (parades).
