For the record, I agree with Piketty, Marx, and others of that particular persuasion. I'm all for progressive taxation, wealth and inheritance tax, all of it. But I'm also not ignorant of history...
Anyhow, the example was just rhetoric. The point is that communism started because people thought it was unfair that there was a rentier class who essentially monopolized wealth because they had inherited wealth. And communism fell because people thought it was unfair that people who were lazy made the same as people who worked hard.
Studies have shown that most people in western societies prefer inequality as long as someone has less than them. They think inequality is 'fair'. Why do you think people value celebrities and rich people? People are happy with our 'lottery' system, where anyone can become rich, even if the majority don't, and even if the average struggles...
It's funny, you're arguing for progressive taxation, but you don't understand the history behind labour movements, equal rights, welfare, socialism, etc... Or why communism is relevant in a discussion about rational choice, inequality and perceived fairness.
I do get it though - Americans have been taught to hate communism, and thus have purged an entire century of socialist philosophy from their collective thoughts.