It turns out the worst enemy of Australia’s most important ally, the United States, is itself, and the invasion across their southern border is the biggest national security disaster since both Japan’s raid on Pearl Harbour during the second world war and the 9/11 terrorist attacks by al-Qaeda. It’s hard to take a country seriously that has so blatantly failed to protect its own sovereignty and allows foreign adversaries such as Russia, China and Iran to work by, with and through elements of the Mexican government and the drug cartels to sow the seeds of America’s long-term decline.