Eg, To a pretty reasonable first approximation, all of Amazon's income is either going to be (1) distributed to shareholders and trigger income/capital gains tax or (2) invested in making goods cheaper for amazon's customers.
It isn't immediately obvious that it is a good idea to tax a system designed to get goods to people cheaply. The money Amazon reinvests in itself is in the short term all about making life better for its customers, not its owners. In the long term that reverses, but the reversal triggers additional tax events.
> It's ridiculous my tax rate is over 30% while wealthy people has it at 15%
The wealthy will be paying much more tax than you though. In raw amounts, the wealthy are doing much more to run the government financially than you are by orders of magnitude.
It isn't immediately laughable. A billionaire is making an absurd contribution vs. other taxpayers even at a 5%. And again, that part of their money isn't going towards themselves, it is difficult to consume that much in real resources in a year. It is likely going to investing in things that other people want.
There is no obviously-right or obviously-wrong with tax. Systems are complicated.