Yes, if they acquired an other citizenship and gave up their US citizenship and paid an "exit" tax, they could do that.... From what I've read, that happens very rarely, but more often now, with US capital gains rates at a historic low.
You have a very optimistic view of what motivates our government's policies, I'll give you that. Like Sol said earlier, I'm surprised by how accepting this community is of current tax policy (generally, not saying everyone's ok with every detail).
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I would say most people's views on here are more agnostic towards government tax policy than accepting. I am very libertarian and I used to get fired up about it, especially when Republicans had complete control for six years and only succeeded in making the system more progressive, removed massive numbers of people off the income tax rolls, and failed to control spending and making the system more complicated. On tax policy, they proved to me that they're only a little less bad than the other side based on my beliefs. At this point, I only generally want to get fired up over things in life that are controllable.
Regarding capital gains tax treatment and whether or not that's really a break for the investor depends on the asset class. Its very favorable if you're a direct investor in real estate. Its really not favorable if your investment is a domestic stock, which is already a C-Corp paying 35%-40% of its earnings out in taxes each year. This creates gains in its book value (which is after-tax capital), a partial driver of stock price. Then you turn around and pay a second tax when you sell your stock, who's value is a combination of book value and its multiple above book value. I have the same issue with taxes on dividends, whose slightly less bad double taxation is the only nice hangover from the otherwise disastrous tax policies of the last 14 years.
Remember, corporations don't pay taxes. Its the shareholder's capital that is being taxed. Mr Buffet sometimes struggles with this, he says his tax rate is lower, which is true. At the same time, he owns 15% of Berkshire Hathaway, which paid $6.9 billion in taxes in 2012. His share of that is $1.03 billion.