Obviously there's a lot more strong arguments for a flat tax than progressive, as has been shown in this thread, but politics and politicians don't work that way, they don't always choose what is best for the nation or the people. They don't prioritize the optimal and most effective solution.
In essence the majority of politicians want to play Sim City, and for that you need a lot of resources = taxes. And the more complicated you design the economical system and taxation methods, the easier it gets to collect a lot of taxes without people detecting that they're getting ripped off, or detecting that the authorities in power are using people's money on useless costly projects and so called reforms.







