You are not hearing arguments from Americans that don't care. I help out when I can, including homeless, starving, pets too. Your hearing arguments from the people that want the system to remain fair. Anyone in this country can do what I did to be able to support myself. The problem is, you do have to commit and do it.
Also, in this country taxes increase as your income increases for most citizens. It can also be taxed differently depending on how you earned it. So exactly how would that first 15k not be taxed for most taxpayers?