Seems to me Nader has a lot of gall accusing Kerry or even Bush of being a political insider. After all, he's the only person on the scene making a comfortable living as a presidential candidate.

I really doubt that most firm Nader supporters are going to respond to any logical arguments about the futility of voting for him and the reality that their votes only help Bush. I suspect in their political world view, summarized by "the government is in rotten shape and it's only gonna get worse!", another four years of Bush is desirable as a means of strengthening their case. Since it would take basically a revolution, or a mass mental breakdown, to actually elect Nader, why not do your little part to encourage that desparate state of affairs?