An excellent story you bring up for my observation, being Australian, I hadn't heard this. This is why I like the internet, learning more and being better informed.
One criticism: Don't make the comment about decency as opposed to Freedom Of Speech. The indecent claim has been used in the past to punish homosexuals, radicals, and is related to Blashphemy in the legal sense (A law which thankfully is not as prevalent as it once was). Freedom of Speech trumps manners in all respects, I think what you mean is that uninformed or bigoted opinions should not be listened to, which is always the responsibility of the viewer. It's our responsibility to view the beliefs and opinions of Racists, bigots, or those who are simply biased, uninformed, or unqualified to present their opinion on the subject as being of less worth than those who specialize in their field.
For a good example of this, I advise you look up "The Justice Game." By Geoffrey Robertson QC, which details many of these types of legal cases in Britain, Australia and British Protectorates, none of which are, or have been, protected by a constitutional freedom of speech.
Sorry, I get touchy when people try to suggest restrictions on freedom of speech, especially in the politeness case, where it tends to hold the same weight as "For the children".
And again, thankyou.