Nader was/is a big a nut, in his own way, as Ron Paul.If you want to weigh the stuff that came before they're president, and look at them honestly, Nader really... shines.
If you think that is all there is to his business, there is no arguing with you. I suspect however, you understand much more than this.Romney: Made his money by flipping businesses like you'd flip a house.
Regardless, I think tax returns are fairly irrelevant, except for any potential conflicts of interest that they may shed light on. But that's really no reason to release them publicly.