Throughout history, people have been arrested for speaking out against war and other forms of government policy. In cases more than not, they are arrested because in the time of war and hardship, the people give up some rights.
Its a bit suprizing that Austrailia came out with this out of nowhere though.. perhaps their having a major problem out there. I don't hear much news of Austrailia myself, so I can't really comment if they are or not.
All the same, so people don't get confused as I did at first, I think you meant unpatriotic.
Simple spelling error, no problem in that.. :-p
All the same, I don't completely agree with this, but I know its always been something throughout history done. I personally feel that your voice and the right to speak is one of the last things you'll have sometimes, and you should never be afraid to use it. It was given to you for a reason, and to not use it would be a sheer and unfortunate waste.