Is "Radical Center" an Oxymoron?

In an era of eXtreme sports and politics, the center is often derided as lukewarm, as we even get Jonah Goldberg claiming absurdly that only extremists can build a bridge.  Some fed-up non-extremists are calling for a "radical center" movement.  Why do we want it to all come down to one side or the other.  "You're either with us or against us.  You're part of the problem or part of the solution.  Only yellow lines and dead armadillos in the center of the road".

The feeling of belonging to one or another side of a momentous conflict is so seductive and feels so natural and right.  I think it is a sort of feeling of "coming home" and being "at home".  This must reflect in some way the tens of thousands of years prior to settled human life.  It is so comfortable to feel one belongs to the Donkey Clan with its long history of standing up to (and sometimes dominating) the Elephant Clan -- or vice versa belonging to the Elephant Clan etc.