Why Won't Times Columnists Name Each Other?

The recent Brooks vs. Krugman (with an assist from Herbert) smackdown on the New York Times op-ed page has left a lot of people wondering: Why aren't Times columnists allowed to attack each other by name?  After all, doing so would make these arguments a lot easier for readers to follow.

Well it turns out that, as near as anyone can tell, they are allowed. So why don't they?  We've put in queries to Messrs. Brooks and Krugman, as well as Times op-ed page editor Andy Rosenthal, and we'll let you know what we find out.