Because under the current labeling law- all beef is allowed packaged with the USDA label which most consumers assume means USA beef...
We've had several small packing plants that promoted a USA label- and went broke, because consumers said why should we pay more for shipping and everything, when we can buy US beef at the store anyway- thinking the USDA inspected label was guaranteeing them USA beef....
When all beef is correctly labeled and the packers can no longer use the Fraud of sticking just a USDA inpected stamp on imported beef and passing it off as US beef- then I think you will see the true value of country of origin labeling......