Taxation in Australia versus Hong Kong

Taxation in Australia turns out to be a much greater issue than that in Hong Kong, I am amazed to see tax rates as high 30-45% for the high income earners, compared to the maximum of 16% income tax we pay in HK. I believe this is one of the main reasons why Australians are far more concerned about tax reductions, while significantly more tax strategies are introduced compared to that in my home country.