I suppose I mean to say that this is the thing really - income tax on its own is not working, evidently, given that it is so easily avoided. Surely the idea is that everyone should want to commit as much as they can to the furtherment of their community, nation and species. The very fact that things like this, game-theoretic winner-take-all, tax "avoidance" (because it's legal, therefore morally fine), exist is enough to make me wonder if there is any point at all to my existence, let alone the existence of the poor sods who aren't fortunate to make even as much as I.
But then I strongly suspect I'm a lefty pinko communist and shouldn't be trusted in a proper discussion about actual fiscal policy.
Do it, then. Don't just post worthless snark.
If you depend on a small number of people for the majority of tax revenue, you will end up with unstable revenue. Look what happened to California's tax revenue during the 2008 recession. It dropped because the small number of rich people who pay more than half of the taxes got hit pretty hard by the recession.
Besides, do we really want to live in a society where only a small group of people has a financial stake in the funding of the government? Voters would probably be a bit more informed if they had some skin in the game. We really don't want to live in a society where the majority of voters will always approve spending increases because they know their taxes won't increase, and the cost of the increase will be borne by the top few percent. That will get us a runaway train of government spending.
No, most of the income == most of the taxes, and that is the situation we are already in. My point is that it's hard to justify asking for even more money from the group of people who already pay more than half of the taxes.