Somehow this is overtaxing the rich?

Interesting graphic. Especially considering some facts that go with it
(source s3.moveon.org/images/tax_rate-chart.gif)

Conservative and deregulation policies of the 20's caused the Great Depression. Liberal and regulatory policies, coupled with the tax changes of the 30's led to the long era of prosperity that followed for half of a century.

Conservative and deregulation policies that started in 1980 led to the current financial crisis.

So, wouldn't logic dictate that the tax policies for the very wealthy should not merely mimic 1992, but should mimic 1940-1964?