The government here is the Australian government. Which has legislated to that effect. The GST component, anyway.

You obviously aren't in Australia, and what the American government says is irrelevant. We are not yet the 51st state.

You claim to be in Australia, but you don't seem to have a grasp on Australian import laws. Who did you ask? More aptly, when?

There are many threads about this in 'buying', the relevant board. You might like to read them before you make any more misleading statements.