Or maybe people understand that the USA is not the 'Ancien Régime'. Americans are not born as aristocrats and peasants, they are free men 'endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness.' That's why they refuse to listen to those preaching class envy. They understand that robbing 'the rich' and spreading the wealth around is not good for anyone in the long run. American people value their liberty too much to surrender it to the state bureaucrats just because it might make paying the bills a bit easier next month.

By the way, the human history is full of examples of people who acted 'against their own interests'. 'Pure Germans' sacrificed their lives opposing Hitler, white Americans fought against slavery and so on.