If the government is correcting an error for $500 on your taxes, its almost certainly doing that using an automated system with very little human-time-per-case for oversight. This is possible because of developed-world infrastructure -- all relevant numbers are digitized and entered into computers, all people are documented and contactable, etc. -- which is missing in Afghanistan, so it's not super surprising.

Edit: Woah, HN, you have truly gone crazy. My comment is an explanation for why accountability is so much harder in Afghanistan than the developed world. It is not a general defense all US tax-collection procedures, and it is especially not a place for you to vent frustration about how the lack of pre-filled-out returns in the US benefits tax software makers.