Partisan politics is too narrow - some "political concepts" become enmeshed in one's personal identity even if they are irrelevant to whether the community organizer or the business executive should be President of the United States.

Consider how and why the "creepiness" and "feminism" discussions broke down so badly, so quickly, and so acrimoniously.

In short, Paul Graham is right when he says (essentially) "Personal identity is the mindkiller"