Link to New York Times article on why reasoning evolved: so we can win arguments

Here's a link to a New York Times article on the evolutionary function of reasoning.  The claim: reasoning evolved in order to allow people to win arguments. 

http://www.nytimes.com/2011/06/15/arts/people-argue-just-to-win-scholars-assert.html?_r=1&ref=arts

Darcia Narvaez is quoted as disputing the view; Jon Haidt is also quoted.