My guess is that they want to level the playing field for the super-rich. If all are taxed, they feel it's even, if they give up their wealth, it weakens their

My guess is that they want to level the playing field for the super-rich. If all are taxed, they feel it's even, if they give up their wealth, it weakens their ability to remain in the club. On the flip side, they may have a sense of responsibility to contribute more, but no gauge of when the contribution is enough. If the government makes that decision, then they resolve themselves of making the judgement.