Perhaps it's good for one to suffer. Can an artist do anything if he's happy? Would he ever want to do anything? What is art after all but a protest against the horrible inclemency of life?
Americans have so far put up with inequality because they felt they could change their status. They didn't mind others being rich as long as they had a path to move up as well. The American Dream is all about social mobility in a sense - the idea that anyone can make it.