Burning a book isn't ordering all other books of its type be burned, but it sure sends a message -- let's destroy this representation of knowledge because it contains knowledge or thought I don't approve of. It's entirely analogous to book-burning, though not book-banning (which is analogous to making such data illegal -- though it's arguable that since the federal government is really the only body capable of collecting such data, banning the federal government from collecting it IS banning it.. an argument for another place and time, I think) but OP didn't claim it as such, so it isn't an overstatement.