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I'd argue that society ensures (or should ensure) that we, collectively, do have the average person's interest at heart. The problem is when billionaires like these effectively decide to opt out of society. Stop paying taxes, bend the political system to their will.

Even if you think of them as the most selfish people possible, billionaires ought to have the average person's interest at heart. Because once the country is full of average people who are unhappy with their lives it typically doesn't work out well for those with power.