Why does Australia adopt a multicultural policy?

The multicultural policies adopted by the United States and Canada are passive rather than active. For various reasons, such as the trafficking of black slaves in history, Latino immigrants from South China (Mexico and the United States are connected by land), and the employment of workers to build the Pacific Railway, etc. A large number of blacks, Latin Americans and Asians have objectively lived on the North American continent, so the United States and Canada have to face the reality and adopt a multicultural policy. In the early days, like whites, they killed Indians, treated blacks as slaves, and implemented the Chinese Exclusion Act.

On the other hand, Australia, as an island country, has been inhabited by white people for a long time and there is no natural migration of foreign population, so they have the conditions to pursue the white policy for a long time, and even immigrants only accept white people from Europe. The proportion of white Australians is still as high as 92%. Do you think the government and parliament elected by white people, who account for 92% of the national population, can give priority to non-white people? Can it be multicultural? If the government and parliament elected by 92% of the population make policies for the other 8% of people of color, can they be elected in the next term?