Colton, what should be changed, then? What is the "fair" amount that should be taxed for different levels? Why exactly is it harder for the $10k earner to pay 10% and how do you quantify that? Is it easier for the $100k earner to pay $30k in taxes than for the $70k earner to pay $1k?
I don't have time to reply to most of this, sorry. But to address the question in bold, it's because of discretionary income (or lack thereof). The $10K earner has a much larger fraction of his/her income that goes to the necessities of life such as basic food, basic clothing, basic shelter, basic health care. Maybe there are other basics I'm forgetting. So charging that individual a lower percentage of income tax seems just, to me.