Union Jack represents british colonisation. my (extremely vague) knowledge of the national anthem is about it being free and a great country?
Yes, I just don't see the difference to what the two things are supposed to do. Both are supposed to represent to outsiders what a state is (in my mind), perhaps you have a different view though. In my opinion the anthem does some up what Australia is (just as long as they can figure out what girt is XD), despite how slow and arduous it is to sing, just as well as the flag does.
And to Chavi, I generally agree with what Howe says to an extent but feel he takes things to that next level or attacks personally a little too hard if that makes sense XD