That's kind of how we built our system that we operate. It's a "smart persons' benefit" type of system. We could have a flat percentage based system. However, w

That's kind of how we built our system that we operate. It's a "smart persons' benefit" type of system. We could have a flat percentage based system. However, we/Americans, hate the idea of non-fairness. (it's built in our dna) So we end up taking a simple system and keep making exceptions to it. It's great, but it's gotten really complex. For example: If you put a simple tax system in (everyone pays 7%) the claim is that "Poorer people are negatively affected". (Their value of the money is higher than a much richer person) However, when you have a progressive tax system, you have people concerned about being in higher tax brackets. (Really isn't that big of a concern in a progressive system, but it's harder to do the math).