What makes you think that "keeping their cash there" is beneficial to any society? I am obviously getting political here, but money for its own sake should not be a goal. Money should be invested or taxed.

Why should I make any at all if at the end of a long productive life you jump out from a corner and says how these fruits should be deployed? For kicks? I might, and many more able than me do -- but there's a breaking point for everyone. And I found that the tax-man much more resembles that old cliche about the "greedy", the "rich", the capitalists -- it's the taxman that truly can never get enough, never tax enough, never borrow enough, just to keep their own fairytale reality going another day or decade.

>Money should be invested or taxed.

Agreed. But there is what should be done, and what is done. I don't think this is anyway admirable, or of any benefit to society, (it's basically taking wealth harvested within a system out of that system) but I do see that it might be a possible solution for a perceived problem that exists for very wealthy individuals.

You're ignoring one particularly American problem, which is that Americans who harvest wealth outside the system of their country of citizenship are still required to pay taxes to it. I suspect that these sort of proposals would probably go away if rich Americans who moved to Hong Kong or Singapore were not expected to continue paying into Uncle Sam's coffers.