Take for example some large corporations. I.e. if Amazon or Google stores their customer information carelessly, and someone steals it - then Amazon would be victim, and if you say that they should have protected the information, you are blaming the victim because you don't like them?
The American revenue service has even larger resources and also a larger responsibility than even the largest of multinational corporations. They should be held accountable for what they do (like the tax officials in any country).