As to Palin, Stein sees her as a sign that the GOP embraces evangelical social conservatism without room for those with divergent views.
As to taxing the rich heavily, Stein sees it as a matter of social equity.
I disagree with Stein on all these things, but those are his reasons.
In Class Warfare, Guess Which Class Is Winning
You don't have to read the whole thing if you don't want to. The first few paragraphs are sufficient to give you the gist of it.