Can you tell us the last date China dropped a bomb? Please?
You're confused. China doesn't do imperialism. China's actions in Tibet weren't imperialism, they were liberating a feudalist society that still used slaves. Taiwan is literally allowed to exist as a thorn in China's side, but that's not good enough - you HAVE to believe they are going to invade it. Because that is all you know.
Between the US and China, it is certainly the United States that will inevitability attack Australia. You just don't realize it because you're too busy slurping up ChinaBad propaganda. With the US as your ally, you've already sealed your fate. And China will happily watch your decline.