Why Australia is blocking South Korean travelers and not US travelers is mind boggling at this point. The smallest amount of intel sharing can stop the infected

Why Australia is blocking South Korean travelers and not US travelers is mind boggling at this point. The smallest amount of intel sharing can stop the infected from traveling. Virtually every case to date in SK has been caught by now, their testing regime is incredibly comprehensive and free for everyone person in the country, even illegal immigrants. By comparison the US is willfully not testing people presenting symptoms coming back from infected areas, even insurance covered citizens will pay absurd amounts for an on-demand test and it's clear to anyone watching the government is putting it's head in the sand.