That's not the real lesson, however. The real lesson is that in all cases except one, there are two rates that generate the same revenue from tax collections. In your figure, draw a horizontal line that cuts the tax curve at 35% and extend it to the right and somewhere around 90% is a rate that generates the same revenues as does 35%. Personally, the max point at 70% is Liberal BS. Empirical studies in India and the UK show the rate to be around 32%, but varies with exemptions and deductions. Friedman suggests it's 17%, with zero deductions.
For Obozo to criticize tax payers for "taking advantage" of loopholes, who does he think wrote the tax code? You politicians put those in because you thought it would enhance your chances for reelection. A bad case of pot-kettle-black.
Except for GE. It's OK when GE pays zero percent by taking advantage of "loopholes."