This isn't a random government. It's the government of the host country of an international event. Just because it's an international event it doesn't invalidate the sovereignty of the host nation. In this case Australia is rightfully enforcing it's border rules.

You might disagree with Australia's policies but they are created by lawfully elected representatives of the Australian people. Attempting to ignore or bypass these policies is actually impinging on the freedom of ordinary Australians to have their voices heard and their safety protected by their elected government.