The intruders open fire. The U.S. officers return fire and call for reinforcements. An undisclosed number of American troops are also killed or wounded.
Some terrorists manage to flee back to Mexico.
Others are apprehended and held at a U.S. prison, pending an investigation and possible criminal charges against them. That's the story. Now, picture yourself a judge whose job is to investigate this incident, affix the blame and recommend further action. They merely carried out their duty to protect the country's border and sovereignty. Both are to blame.