Your post evidences a PROFOUND ignorance and blindness.
The purpose tax havens serve, as noted by Dan Mitchell, whose economic literacy vastly exceeds yours, clearly, is to prevent other nations from imposing tax regimes so confiscatory as to drive wealthier individuals (who pay essentially ALL the federal income tax in our country already) into sending their money offshore.
And, by the way, MOST IGNORANT ONE - tax evasion is a crime. Did you miss the entire article's premise, which is that Lew has COMMITTED no crime in this, just as Romney COMMITTED NO CRIME in his offshore investments?
Good God, man, purchase a clue somewhere, will ya?