We don't. But many good investments don't look good at first, and often it has taken a single person to go out on faith to put money into a high risk/high rate

We don't. But many good investments don't look good at first, and often it has taken a single person to go out on faith to put money into a high risk/high rate of return investment. If their capital gets taxed at a much higher rate, they will more likely be conservative with what they are allowed to keep and wont place risky bets on the future.