Simple - Republicans/Conservatives feel themselves to be creatures of privilege, either economically, socially, or whatever. As such, they tend to be happy with the status quo, and don't want to rock the boat (rise of the Tea Party an outlier event).
Dems/Libs are denizens of the world of "lack of privilege," whether real or imagined. As such, they feel obligated to protest everything to achieve what they call "a level playing field" (no such thing, of course).
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