Why doesnt Australia have laws protecting free speech in all forms?

Currently in Australia free speech is only protected by the courts and only in cases of high political matters, and Australia is the only major Anglo-American English speaking country that does not have a Bill Of Rights... Considering Australia is a signatory of the U.N charter of Human Rights is it democratic to not have one. And why is it seen as Undemocratic to introduce a Bill Of Rights
 
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