Cargo culting at its finest. Google is really smart about a lot of different things, but they know fuck-all about social. They were just going through the motions.
Real Names policy was the brainchild of a 40-yr-old multi-millionare who was an expert in cultivating his personal brand and image, and knows not donsay anythig embarrassing online.
Why would you care to use Google+ in any other way, he thought.
Yeah they forgot that people only used real names on Facebook because it was extremely private (only people in your university could see you). Google+ on the other hand is full of public actions - Youtube comments, app reviews, etc.
[1] http://techcrunch.com/2008/12/17/myspace-quietly-begins-enco...