Australia kind of leapfrogged past the US and even the UK in terms of a soft tyrannical take over. I found it surprising, but as soon as they lost their ability to fight (gave up the guns) the changes have been moving very quickly.
You are making a mistake in assuming the Australian culture is the same as US culture. It's one our own commentators have actually started doing too.
Australia has never had the same views on freedom and rights that the US has. It has always been understood that there is a compromise between personal freedoms and state control. An example of this is that we don't have a Bill or Rights, we don't have a Freedom of Expression, in fact there are no "rights" in our federal law at all. (We are a signatory to the UN human rights convention and one of the territories has rights legistlation which complicates things a little, but in general when an Australian mentions their rights they have no idea what they are talking about).
So this isn't a recent tyrannical takeover and raising guns as an issue is completely irrelevant. Hell, we started has a prison colony where everyone had to obey orders and there has never ever been a serious movement of Australians employing violence against their own government. What we have is a misstep by a government regulator that has very little idea what it's doing. The IT press are whipping up the rage to try and ensure that this is an election issue, for at least a day or two. The major parties will probably move strongly to avoid it becoming a problem for them and the regulator will be put back in it's box for a few years.