You really need to learn a little about respective shares of taxes vs income. All of your arguments are emotion based, here is the reality check
So, yeah, all of these whining how capital gains taxes being too low don't change the fact that upper brackets not only pay a lion's share of taxes, they also pay them well above the respective share of their AGI - whatever the actual tax rates are. So, what fair share are you talking about? I am in the upper 5% bracket - I would love your idea of 15% flat tax on everybody, 'cause right now I paying my taxes and somebody's taxes too.
Capital gains taxes are idiocy. For me to get any capital gains, I need to work my ass off, get taxed at the max marginal rate, save some money after the taxes are paid, invest it (with obvious risk of loss), and if I get any gains on my investment - you wanna tax me yet again? How about I consider an alternative - I'll just sit on my savings, take no risks, pay no additional taxes. Then we'll see which way would stimulate economy better.