Conservatives realize the truth that taxes destroy liberty and erode the basic structure of society. Therefore, it is reasonable to expect that countries having a higher top marginal tax rate would have a lower score on the Human Development Index.
However, as you can see in the graph above, the Human Development Index does not reflect this fundamental fact. Obviously this demonstrates that the Human Development Index has a liberal bias!
In the following graph, below, I show the corrected data, with the liberal bias removed. (Please notice American Exceptionalism!)