If there were political will to tax the rich then you'd have to, in addition to changing tax law (obviously), fund IRS investigations to ensure the taxes are actually collected. Throwing up your arms and saying "well we can't tax the rich, they're too powerful and wily, and will easily commit tax fraud to evade those taxes, and in actuality you'll bring in less money" is exactly the weak attitude that stalls efforts to fund vital services. If you think people will commit tax evasion, then put more resources into investigating tax evasion. Historically, money spent recovering taxes has yielded more than the cost of said investigations.