Your points are all well stated but he is quite funny ("nerdgasm"...come on). Otherwise - just add healthcare reform and Wallstreet debacle to your list and then build a bunker and never come out.
Also, you're totally missing the point of Dexter - it's about addiction and powerlessness.
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You seem to think only the 'good guys' are worthy of admiration. Ethics and self-interest aside, I think it's perfectly acceptable to admire an impressive feat or trait, regardless whether it negatively or positively impacts you. Notice, he was not admiring the theft of billions of dollars, but the character trait behind the action.
My favorite quote on the subject is funnily enough thanks to J.K. Rowling; "He-Who-Must-Not-Be-Named did great things. Terrible! Yes. But great" -Ollivander