The obsessive desire of the current government to protect the right to offend and humiliate people on the basis of their race or religion has been driven, in large measure, by the Institute of Public Affairs. The IPA has a mixed* record on freedom of speech, and on the kind of offensive speech that is the subject of 18C.
Some IPA fellows, such as Chris Berg and Matthew Lesh take the Voltaire line, defending free speech even when they don’t like the content. And, as far as I can tell, neither Berg nor Lesh has ever said anything offensively bigoted.
Unfortunately, they appear to be in the minority at the IPA. More representative of the general atmosphere of the IPA are cases like this and this, where IPA fellows were caught saying in public the kind of thing they want to protect legally.
And while Berg is keen to protect the right to boycott, the IPA also published this piece, suggesting that critics of coal could be prosecuted under the Corporations Act. I had a long series of Twitter exchanges with Tim Wilson, then “Freedom Commissioner” and now a Liberal MP, in which I asked if he would disavow this suggestion. He evaded the question repeatedly then (IIRC) blocked me.
Overall, I’d say the IPA should clean up its own act before pretending to lead a crusade (or jihad) for free speech.
* I mean this literally, not as a euphemism for “bad”