The highest marginal tax rate for income earners is over 50%. And it takes effect at much lower incomes than other comparable countries.
In Australia? The highest marginal tax rate is 45%, and due to the nature of progressive taxation unless you have an absurdly high income most of the income of even high earners is taxed at a lower rate.
Source: I am in the top tax bracket and until recently did my own taxes
I'm not going to spend my afternoon doing calculations to prove my point as what is required is doing the same calculations for other nations, the number you're quoting is not what is meant by marginal tax rate for a start but the linked article provides the context needed.
Again, I have been in the top tax bracket for around a decade and have never paid more than 40% of my taxable income in tax without an accountant
Australia has lower sales taxes, lower income taxes, no requirement for private or employee provided health insurance. It is straightforwardly untrue that Australia is high taxing. Even if it were true then the level of public services provided would make it worthwhile.
Maybe the top tax rate kicks in lower but the tax free threshold is also higher than in most countries which is the correct balance.