A few hackers does not a society make.
I do however agree that they represent the frustrated viewpoint of a significant number of Australians.
However as I have said in a previous thread, this kind of activity just means a bunch of overtime for a bunch of system admins and matter little to the people who make the decisions.
I think the good thing out of this is that there will now be a bit more publicity and hopefully a whole lot of people who didn't know about the legislation previously that will know know about it and hopefully write to their local member.
It's true that a handful of people may not generally represent society as a whole. To say that they are representative of a significant number of frustrated Australians mirrors (at least from my viewpoint) what happened in my country just a couple of hundred years ago. Simply put, it's a revolt from a move toward a more repressive society. The parallel is fairly uncanny as far as the broad spectrum goes. Does it make work and life more difficult for sysadmins? Yup. Does that suck? Yup. While it will bring publicity to the pending legal scripts, I don't believe that it will make too much of a difference. From my experience, most people are sheep, readily eating from the grain trough most available to them. ...at least until life becomes so unbearable as they are forced to change. So what I'm looking at is a group of individuals who are motivated to watch out for their own privacy while carrying the load(and in this case, the legal risk) for the general public. Everybody else is along for the ride whether or not they care about what the outcome of said legislation is. The best outcome from this that I can see would be a firestorm of contact to the right public officials condemning the legislation and thus forcing it to be scrapped. The less the firestorm, the worse the outcome for everybody. I think a good start to that is to cripple your oppressive government.
...as an aside, if one were affiliated with anon, it would behoove such to rally as much support for their actions and raise public awareness as much as possible. Groupthink speak wise. I won't however go so far as to say that their 'motivation' isn't quite self serving. Maybe it's a mixture of both sprinkled with a healthy dose self/group or ideological grandiosity.