In the US specifically, a huge basis of our political history is based on circumventing this particular view of morality. A lot of this sentiment is captured in the phrase "Tyranny of the majority"[1], and was formally laid out in the Federalist papers, which form a strong underpinning of American political thought
"if we take into the account the women and children, or even if we leave them out of the question, a great majority of every nation is wholly destitute of property, except a small quantity of clothes, and a few trifles of other movables. [...] if all were to be decided by a vote of the majority, the eight or nine millions who have no property, would not think of usurping over the rights of the one or two millions who have? [...] the time would not be long before courage and enterprise would come, and pretexts be invented by degrees, to countenance the majority in dividing all the property among them, or at least, in sharing it equally with its present possessors. Debts would be abolished first; taxes laid heavy on the rich, and not at all on the others; and at last a downright equal division of every thing be demanded, and voted."
This is the "tyranny of democracy" they feared, an Orwellian notion. I recommend Graeber's "The Democracy Project". He was one of the many Occupy founders, and is every bit as "American" as any of these government guys.
(Not to say that your argument about democratic morality doesn't have its merits, I'm just curious about your take on it)