John McWhorter: Should we care about the Oxford comma?

A recent court case seems like a victory for fans of the grand old Oxford comma. To many, it feels natural to write "Philadelphia, Pittsburgh and Cleveland." But just as one may feel lazy saying "My brother and me went home" rather than "My brother and I," there is a sense that it is more proper to write "Philadelphia, Pittsburgh, and Cleveland," inserting a comma after the item before the last one.