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There are two novels that can change a bookish fourteen-year old's life: The Lord of the Rings and Atlas Shrugged. One is a childish fantasy that often engenders a lifelong obsession with its unbelievable heroes, leading to an emotionally stunted, socially crippled adulthood, unable to deal with the real world. The other, of course, involves orcs.... John Rogers

I did a little looking and I was wrong here. The reason that revenues generally stay the same or go down after increasing taxes on investments is not because people pull money out. It's because they leave it alone. Instead of moving the money around and paying the higher tax, they just leave the stocks alone and don't sell their homes.
Moving that money around is important. First, it creates the tax base and often increases revenue. Additionally, we are not talking about the companies that have a large cash pool that need more money. We are talking about start-ups getting funding. That group is one of the largest employers in America.
Omniscience just sucks without omnipotence!

The government DOES "pay people back", CT. There's a deduction for assets that are qualified as capital gains that sell at a loss. As for why "should" this income be taxed, well, the government needs money to run. No, a deduction will not make an investor whole...but the government does not insure assets (other than deposits in banks, etc.)
The most efficient method (leave aside our byzantine method of implementing it) for our government to use to raise money is to tax income. A gain on a capital asset, at sale, is income.
I get your double tax argument, but it doesn't really fly. The income that is earned is all that is taxed; that which was invested to begin with is not.

" Love your enemies and pray for those who persecute you, that you may be sons of your Father in heaven. " - Matthew 5:44-45 Beer, Guns, and Baseball (My blog)
Whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government

It shifts capital to the political class, not the middle class.
Having less to invest with does not necessarily mean wiser investments. It may look that way, but having less capital in total also means that riskier but potentially much more fruitful investments don't happen.It also encourages people to make wiser investments.
Is the benefit that comes from government spending and investment outweigh the benefit that comes from private investors making those investments with their own money? You're dodging the heart of the issue.You see, we don't distroy money when we tax it away. It gets redistributed. Most of it gets redistributed by the gov purchasing stuff (creating demand) or building stuff (creating infrasture) or hiring people (creating jobs). Naturally all three of those methods of redistribution create jobs, and those new jobs create more jobs as when people have money they spend, and when money is spent it is used to purchase products, which are produced, requiring more people to be hired. Some money gets redistributed for welfare, as a conservative I am totally against welfare, but regardless, that welfare creates demand.
Entrapanures and investors both love demand because increased demand translates into increased profits. Every penny that the wealth pay in taxes gets returned to them in the form of additional profits, thus taxation does not neccessarally reduce the wealth of the wealthy. In most cases it improves it. Thats why the wealthy got wealthier during WW2 when they were taxed so much. Sure, most of their profits were taxed away, but their profits were enormous. A small percent of an enormous amount is a lot more than 100% of nothing. Those increases in profits more than make up for higher taxation.
Part of the reason that income tax is as high as it is, is because capital gains taxes are as low as they are.
If we were to increase capital gains taxes and lower income taxes, the middle class would tend to invest more as they would have more money to invest. That alone totally blows the theory that lower capital gains taxes results in higher investment. People invest 100% of their "excess" income. If the very wealthy are the only ones with excess income, then only the wealthiest of us will ever have any true financial wealth. If the middle class are allowed to keep more if their money, then the middle class can also invest and have a piece of the American pie.
What I am saying is that if you want to be all about the uber rich becoming richer, then keep on repeating all of that far right class warefare crap. Who knows, you may get lucky and become uber rich yourself one day. But if you have any interest in all Americans being able to get a head in life, then you need to abandon all of that rhethoric.
" Love your enemies and pray for those who persecute you, that you may be sons of your Father in heaven. " - Matthew 5:44-45 Beer, Guns, and Baseball (My blog)
Whenever any Form of Government becomes destructive of these ends, it is the Right of the People to alter or to abolish it, and to institute new Government

??? Of course we should allow banks to charge interest. And banks should have to pay taxes on the profits they make, and people who deposit money in banks should have to pay tax on their deposits.
People choose the level of risk they feel comfortable with. The higher the level of risk, the higher the profit may tend to be. they are rewarded for risk by higher profits. We don't need the gov to subsidise risk by giving risky activities discount tax rates. Really, the gov shouldn't be subsidising anything unless it subsidises that same thing for every American (like military, roads, education, police).Where does risk factor into your argument?

How's that?
Without the gov benefit of military protection and the other things it offers, we would have little wealth as our weath would be plundered year after year by invaders. So in a way, some government expenditures are indeed more important that private investment. Anyhow, I never suggested that we have a 100% tax on anything.Is the benefit that comes from government spending and investment outweigh the benefit that comes from private investors making those investments with their own money? You're dodging the heart of the issue.

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There are two novels that can change a bookish fourteen-year old's life: The Lord of the Rings and Atlas Shrugged. One is a childish fantasy that often engenders a lifelong obsession with its unbelievable heroes, leading to an emotionally stunted, socially crippled adulthood, unable to deal with the real world. The other, of course, involves orcs.... John Rogers